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I think a reason people feel Marinette was being wronged when she wasn't in Chameleon is because the writing will bend backwards to make Marinette "sympathetic" despite any and all actions she makes and that she's the character who's supposed to be the audience's favourite; the show doesn't work as the writers want or intend it to if she isn't.

Think about how different Chameleon comes across when Marinette is and isn't liked by the viewer.

If she's liked, Marinette is trying to protect her classmates from the new girl who's a liar and is deceiving them for perks but all her efforts to expose Lila don't work as her classmates believe Lila over her. If she's not, then Marinette comes off as a bully who's maliciously targeting Lila either because she sat next to her crush or because Marinette is ableist since she's targeting Lila the second she learned she's disabled and demanding her classmates socially ostracize her purely because Marinette doesn't like her without giving any reason as to why she doesn't like her, then pitching a hissy fit and storming off to the bathroom when they question why Marinette is targeting Lila.

As a late diagnosed autistic person, I utterly despise Marinette in Chameleon due to how ableist she was and how she was never called out for any of the stunts she pulled during the episode! Even outside of canon, the Chameleon saltdom refuses to acknowledge how Marinette was in the wrong and they'll claim that it was actually everyone else's fault for making their darling Marinette cry when her classmates didn't blindly believe her and socially ostracize Lila simply because Marinette demanded that they do so.

Let's not forget that if Marinette really wanted her classmates to be cautious around Lila, if she actually cared about her classmates, she could've easily told them that Lila stole Adrien's book which led to him getting pulled out of school when Nino and Alya directly asked her why she doesn't like Lila! The solution was right there and Marinette refused to reveal the smoking gun that Lila had stolen something valuable from a classmate to her supposed best friend Alya. This episode makes it seem like Marinette doesn't view Alya as a trusted friend but as someone who she only pretends to be friends with so Alya will help her with babysitting and Adrinette schemes, a.k.a Marinette is a bad friend who only keeps Alya around because she's deemed her "useful".

I should've mentioned this in my Guilt Trip notes but Marinette comes across like someone who's trying too hard to appear like a disability ally to a crowd of onlookers when she forces the truth about Rose's illness out of Juleka. All of her acts of "helping" Rose is done in front of her classmates as if she's trying to show off how much of a Good Person™ she is to her peers while she's actively ignoring the request Rose made to be treated the same as usual the class and blatantly pushing past the boundaries Rose asked her to respect. It's not a good look for Marinette or the writers when she is constantly disregarding how Rose explicitly requested how she and her disability caused by her illness to be treated when Marinette is "helping" her.

Wow, I had more to say than I first thought I did, Chameleon really does get a rise out of me, huh. Maybe in the far future I'll try rewatching it in full to see how bad the other two thirds of it are but that's only a maybe.

It's also where Lila sees Marinette in the pile of rubbish bins after she falls off them while spying and Lila sees her and her line is similar to “I could take a photo right now, but it would be too easy.” which comes off as ooc for Lila because at this point, they've both declared themselves at war with each other, so the only reason she doesn't take a photo for potential blackmail or to post it online to tarnish Marinette's reputation is due to unwarranted plot armour shielding Marinette from the consequences or her own actions, because the writer's refuse to let Marinette lose in a way that matters to the narrative as a whole.

The only time you could argue she loses in a major way is in Strike Back when she loses all the miraculous due to being tricked by Felix who she thought was Adrien but that was only due to being influenced by the akuma, so even when she loses, it's because of something else influencing her actions and not because of the actions Marinette willingly made by herself. The only times she "loses" is when the writers have baked in someone or something else influencing Marinette so there's a convenient scapegoat for when the writers need a way to have Marinette avoid accountability because "it wasn't really her fault, it was actually someone else's fault so you can't blame her."