"Why is OP so mean" It's her personal Tumblr blog. She's not saying anything genuinely harmful like being outright racist or transphobic, she's just being straightforward in giving her advice.
"Writing a cohesive plot is a different wheelhouse from OC creation" yeah exactly. She's not shitting on your doll-playhouse funtimes, you can still go ahead and do that, just be self-aware you're playing with dolls. If you want to start writing meaningful stories, you have to know what makes a story a story before writing it because even that basic requirement is needed to improve on writing. OP isn't saying bad art shouldn't exist, she's saying if you want to move from making bad art indefinitely and actually start improving, you need to lock in. Like how you can't improve on colouring if you aren't even willing to engage in colour theory. If you want to keep making and enjoy making bad art, go ahead no ones stopping you! That's awesome! Just don't 1. Expect others you end up sharing it with to enjoy it, and get offended when they don't and are honest with you 2. Try to posit your work as up there to honest-to-god decent writing. For me personally at least, OP's post and my reblog comes from a place of frustration towards no. 2. A lot of people, especially in fandom spaces, treat their OC writings with so much gravitas that they proudly proclaim their "fixit fics" and "AUs" as good art, instead of just fun playhouse times. And that culture bleeds into mainstream writing as the biggest fandom personalities who are now 30-40 year olds get their bad writings published, because publishers look at follower counts and fans of said writers will buy anything to "support small artists", give high undeserved praises and the whole thing feeds into itself. People like me genuinely search out good writing get recommended their works, then get disappointed and in many cases have wasted our money. Which makes us sometimes internally blacklist certain "keywords" these writers often use for advertising their works, which unfortunately leads us to miss out on possible genuine gems out there because of a few bad apples with huge followings on whatever social media platform.
"How does this lead to someone being racist??" Hey so I did say 'if you embody the average fandom Tumblr user' and that's context. This is one of those things you'll come to understand later in your writing journey, if you're interested to improve that is. The content surrounding a sentence, might provide more depth towards said sentence. What I personally meant by this, was in reference to how extremely white and USAmerican centric Tumblr fandom is, how a lot of them genuinely ignore the realities of the Global South or even the minorities within their own communities, and end up writing "progressive" stories that are utterly racist and offensive if you actually view people outside of your own community as people too. Another thing that comes to mind, are those reblogs and reactions from Tumblr users in reaction to a post about acknowledging climates and foodstuffs in the Global South in your writings. It was just genuine writing advice for interesting worldbuilding, especially if you're trying to make a world comprising of multiple polities and biomes, and the reaction to it was horrid and incredibly racist. But it's okay because they were all couched in "progressive" language and said by blogs who are "strong allies" of minorities. Hence why I also said tone deaf. Because being racist is one thing, but being racist while genuinely thinking you're a civil rights activist is another.
"It's only worth making things that are good?" No one said that. OP specifically is just giving advice on what to do if you want to learn and end up make things that are good. Idk, but wouldn't you want to improve as an artist? Isn't that inherent in art itself? The want to learn? To improve? What's with all the reblogs proudly announcing they like just making bad art and people should stop criticizing them for it???? Like yeah you can keep making bad art if that gives you enjoyment, but like, you don't feel even a tiny bit the urge to explore? To learn? To aspire??? Ig the world is a very colourful tapestry, and my view is just a bias caused by me and surrounding myself with friends who love working and improving on our art and hobbies, and there's definitely just people out there who are incurious, and are content with that. And I'll concede that I should be fine with that. Just don't go expecting people other than yourself to give you any praise on your works, and please for the love of god don't share your political opinions or think you have anything meaningful to say on public policy, especially if you're self-aware and content with being incurious and unwilling to explore out of your comfort zone. If you're incurious regarding art and feel the need to get defensive over mundane albeit roughly worded writing advice, I can't imagine the levels of your incuriousities regarding more complicated topics.
"Oh if no one will say it, I'll say it: OP is an asshole" yeah so a lot of people have already said that before you. Not exactly original. Don't know why you felt the need to say it like you're making a profound observation. Maybe read the notes before putting so much self-importance on yourself.
If you've read this far, why are you people so weird and incredibly rude to Anne? She will say the most mundane observations and you people will flock to the post and reblog with your most asinine takes. Again it goes back to my whole bit about racism, bcz the only other Tumblr users ik who get this similar treatment, where they can just post mundane things, point out observations or post a critique they have of something, but end up getting bombarded with people reading their posts in bad faith and hate-reblogging, are other non-whites (primarily non-USAmerican too) and/or transfemmes. Like there's a clear pattern here and I'm curious if you guys are all willfully ignoring it or just actually unaware.