Oddly enough, most hate I've seen for the show comes from a specific subset of fans of Henry Cavill (and game Geralt) that are firmly claiming "woke culture" is destroying the Witcher they love, by pushing their agenda onto the show, and that see Cavill as the ultimate alpha male dudebro (hating on "The Witcher" and its feminist and pro-LGBTQ+ themes is an incel's idea of having a good time!)!
They are essentially the same people that are mad Ciri became the protagonist of the 4th videogame and call her looks "ugly".
They hate the women casting for the sorcerresses on the show with a passion, because they are supposed to embody the pinaccle of female beauty perfection, while on the show one is "morbidly obese" (the exact words I've seen used) and black when she's supposed to look like a greek goddess (spoilers alert, she does on the show!), Triss is supposed to be all red hair and white skin, Yennefer a raven haired white lady, etc.!
Before Season 3, in their opinion, Jaskier was given way too much agency on the show (especially in Season 2 when they made him the Sandpiper) when he is supposed to more or less be a womanizer that objectifies (again, mostly white... With the occasional succubus) women, and will refuse to stop oogling their breasts even when asked. But now, they've made him *gasp!* gay (they don't believe in panromantism/sexuality, much less in sapioromantism/sexuality, and it shows)!
And, to "legitimize their hate", they'll tend to say that the diversity on the show doesn't respect the Slavic world of Sapkowski (when the author himself clearly said that his books aren't particularly meant to be read through a Slavic lens, and it's a fantasist, fairy tale world), and twist videogame narrative and character to pretend that not staying true to the game is disrespecting the books.
They'll claim that this is why Cavill left, too!
Sadly, each time you see Cavill defending how he petitioned the writers to stay true to the books, he's mostly defending the game rather than the books themselves. And he's impossibly vague about it (so again, as fans you're the one needing to fill the blanks and decide what he means by that).
I think the only main cast member with some firm knowledge of the books, is actually Joey (because you've got quite a few other books nerds in the ensemble).
And, when you take into consideration that Cavill was refusing to be talkative and say his line on the show, you realize that this specific Jaskier is more or less saddled with an emotionally ambiguous Geralt that won't banter and share with him like the two of them are meant to be doing (if you go back to the source material)!
So, TV show Jaskier is forced to "constantly assume" what Geralt is thinking, feeling, etc., while taking the complete lead in the relationship, and imposing his own vision/interpretation of who they are to each other.
Even on that front, until Season 3 at least, it was a very "You can decide what Geralt feels for Jaskier", because it's all up to viewer's interpretation!
Ex: You can decide that Geralt's abandonment issues are making him fearful of trusting that he's genuinely loved (platonically or alterously, or perhaps even romantically) by the bard, and is causing misunderstandings between them.
You can decide that him refusing to call Jaskier "a friend" (especially refusing to reassure Yennefer on the subject) means that Geralt is confused about the nature of their relationship, because Jaskier behaves with him like a romantic partner would (bathing him, rubbing salve onto his butt while calling it lovely, etc.) while calling him "his best friend in the whole wide world"... Something that would make tons of sense for an a-spec person with a strong squish that would have been looking for a queerplatonic "travel companion" (Jaskier), but less for someone that would typically expect his close relationships to fall either in the clear category of friendship (emotional intimacy, but without the wish to make a commitment as life partners / marry your best friend / share a family with with them, more or less) or romance (Geralt).
Or, you could also decide that him refusing to call him "a friend" is because Geralt finds his pushyness annoying, because Geralt is clearly an "alpha type" while Jaskier is clearly a "beta type", and yet, he tries to "impose" on him and pretend he's the alpha, etc.
The possibilities for interpretation are near endless!
Even with Yennefer, Geralt gives a lot of mixed signals as to what he feels and wants from the relationship.
I think Season 3 is the first Season where he's more open with his emotions, says "thank you", "I love you", etc.
They've started giving him a clearer direction, and there are a lot less sighs, fucks and grunts coming from him.
Oddly enough, that's also when the actor has chosen to leave, perhaps because Geralt feels less and less like his own.
But yeah, it seems that Joey, as Jaskier, had been more or less forced to play and portray that friendship "on his own" in Season 1 and 2, because Cavill wouldn't commit to a specific type of relationship with his character, either, in a sense.
They have tons of chemistry on screen, and would make each other laugh on set. They are reportedly great friends IRL (and I've no reason to doubt it). But professionally, Cavill's portrayal of Geralt feels very subdued and without clear direction now that I look at it.
And I even think that the reason why I identified with Jaskier so much, too, and found him a bit "co-dependent" with Geralt, is because of the lack of clear feedback from Cavill that is sensed on screen.
People that are emotionally manipulative will constantly hold you in a state of uncertainty about the way they feel about you and where you two stand in the relationship - giving you just a tiny sliver of hope to keep you hooked on the relationship while never fully committing to it - to constantly make you prioritize them and nearly obsess about winning their approval / love.
And Jaskier (Joey) is dancing around Geralt (Cavill) trying to get a response / answer out of him all the time, and Geralt is... up to interpretation!
Is that gaze fond/affectionate? Does he care? Is he receptive to my ideas? What for does he yearn, damnit?!
Who knows?! You figure it out, Jaskier (Joey)!
Joey's read the books, he knows where that relationship is supposed to go to technically stay true to the source material™.
Now that I know that he constantly had to improvise lines to try to say everything that Cavill wouldn't, it feels like he's basically taken the responsibility of trying to make Geralt seem more sympathetic than Cavill plays him on the show, and attempting to move the relationship towards how it is in the books, while playing opposite a Geralt that is not book Geralt, and that doesn't respond to Jaskier as he would in the source material, either!
He's not even the TV show writers' Geralt!
He's Cavill's own private Geralt that only exists in his mind, and that everyone watching the show can own and fill in with whatever blanks they want!
He's just there making grunts, faces and sighs with Jaskier (and many other characters), and you're the one that needs to decide what he feels and what it means!
No wonder some people feel like something about Jaskier, Yennefer, etc. feels "off" on the show, Geralt is "off".
But because "Geralt is us", we don't instinctively realise that it's him that doesn't work with the ensemble! We want to be a part of that world, too, and Cavill is giving us that opportunity.
But he's not embodying Geralt. We are.
So, maybe that's why I instinctively trust the character that's emotionally available and more verbal (Jaskier)'s perspective on the show...
And why my constantly feeling that Jaskier is reaching out to an "unresponsive Geralt" in the relationship comes from the fact that Joey Batey is constantly reaching out to a co-star that's letting him drive the whole dynamic of the relationship on his own, and refusing to commit to Jaskier and Geralt's friendship in any specific manner.
Then, you watch Joey act with Hugh Skinner, and Hugh gives back as good as he gets!
He's committed to the role and the emotions of his character without ambiguity. Sure, a lot will always remain up to interpretation. That is true of any dynamic between characters.
But it's a relationship that's very "spoken" on screen, and that both actors appear to be showing a commitment to, at the very least.
The first feeling I had watching Jaskier and Radovid interact together on screen was literally relief. Finally I don't have to make any mental gymnastics to make it work!
I see beauty (and dysfunction) in Jaskier and Geralt's on screen relationship on the show because I chose to fill in the blanks in a way that I'm sure others have filled completely differently!
Again, it's not bad, but it might explain why so many people with so many different ideologies are so protective of Cavill's Geralt... he's essentially theirs!
An incel can relate to him and connect with him - seeing him as a long-suffering wise stoic no-nonsense man trapped in a world filled with woke nonsense.
A victim of parental abuse can relate to him, and see him as emotionally fragile and trying to protect himself from further hurt.
He's no one and everyone!
It's quite fascinating, really.
p.s. Not all people disliking the show do so out of "anti-wokeness". Like with any adaptation, some people will enjoy it, and others will dislike it. They may be annoyed with the non-linear narrative or Season 1 (a friend couldn't even start watching because of that), for example, feel like it's too far off from their own interpretation of the books, etc. There are tons of reasons not to like it! I'm really talking about the most virulent haters that I've come across that will devote entire YouTube channels to worshipping Cavill and destroying the show, and band together to complain on Facebook each time any post with "The Witcher" shows up! There's nothing wrong about being passionate about the videogames and preferring them to the books either, and being put off by the fact that the TV show is ignoring the game. But there's this very specific subset of toxic gamers (one of them I argued with was also trying to convince me Felicia Day was never harassed, and gamergate was justified) that are excessively vocal on various platforms driving the anti-Netflix TV show movement that you seldom find in other adaptations that feel very validated by Cavill's performance and departure from the show and massively identify with his Geralt. Now I'm starting to understand why, I think.