Part of that might also what would have been common of his day and age. Like it or not, most people are creatures of their erra, and even those that are ahead of the times still have some issues, see JK Rowling.
I'm not exactly disagreeing, but taking off my DA cap, there's elements of this post that hint at stuff I'm uneasy about.
Starting with J.K., the reappraisal of the Harry Potter series strikes me as absolutely bizzare. This isn't about Rowling's trans comments, this is about the work itself. Here's a list of sins I can name off the top of my head:
-The series is anti-semitic (because of the goblins)
-The series promotes chattel slavery (because of the house elves), though also promotes white savourism, because Hermione tries to help the house elves, yet is still promoting chattel slavery because the house elves aren't freed.
-Harry goes to work for the Ministry, but does nothing to change the "systems of oppression." Also, he's an auror, which is a wizard cop.
-The series promotes erasure (the Death Eaters are analogous to Nazis, but while Mudbloods are analogous to Jews, there's no actual Jews, so therefore the series is fine with Jews being removed from the world)
-The series promotes blood purity and elitism (all these wizards and wizards go to this one school, then send their children to the same school, ergo, the series is supporting the British upper classes and the Muggles are the lower classes who are in their appropriate place). The fact that the books reject the concept of "blood purity" doesn't matter, the series is still promoting blood purity regardless as to whether Rowling knows it or not.
-The series is racist because there aren't enough POC (despite the fact that the books are set in the years 1990-1998, and was written from 1997 to 2007; someone actually did the maths, cross-referencing it with Britain's demographics at the time, POC characters are actually over-represented by the maths).
-The series is sexist, because we only see things from Harry's perspective, and don't see the girls doing their own thing. Also, Harry's relationship with Cho is a dogwhistle for fetishizing Asians, because Harry has a relationship with Cho and rejects her, ending up with Ginny, who's white, and therefore, the series is supporting the idea that Harry should stay with his own "kind."
-The series is homophobic, because originally, lycanthropy wasn't a metaphor for AIDS, which was therefore appropriating the gay experience by not making Lupin gay. After it was confirmed that lycanthropy WAS a metaphor for AIDS, the series remained homophobic, because Fenrir Greyback tries to spread his lycanthropy, and that's a reference to the gay scare. Also, Grindlewald is apparently gay, but because he's a villain, the series hates gay people.
(I'll actually grant anyone their frustration with Rowling trying to claim Dumbledore is gay without ever being shown it)
-Crimes of Grindlewald is expressing support for the alt-right, because Grindlewald's followers use the tactic of not invoking confrontation, but daring their opponents to do so. This happens, ergo, alt-right support (I thought that scene was a criticism of Grindlewald's tactics, but little did I know that the work is actually expressing support for the alt-right)
-The films are promoting Brexit, because the epilogue takes place in 2017, and shows the mostly white cast at the end where everything's happy, which is a dogwhistle that Britain will be a much better place with only white people.
I seriously can't make this up. Ten, even five years ago, I'd have sworn that such comments were either parody, or from people who hadn't read the books, but no, apparently there's people who genuinely believe this. Funnily enough, not the children the books are actually aimed at, but of course, they're just ignorant. Or something. It's why I roll my eyes when I've read articles stating, and I quote, parents choosing Percy Jackson for their children over Harry Potter because it's a "progressive alternative." Parents of course have the right to choose what material their children read, but what I want to know is what happens when Percy Jackson becomes a pariah in certain circles. Because everything I've written above, I can just as easily make PJ seem like a cesspit of bigotry as well using the same logic.
Or, I dunno, tell me how I'm wrong or something.
I think the best course is to take the best aspects of a thing, figure out why it worked, and shave off the problematic areas and create something of our own to fill in the gaps.
Again, on the surface, there's nothing wrong with this statement, but it hints at another iffy idea I've seen.
When Rowling made her comments, I saw, without hyperbole, people saying that "we should take the series (back) from her." The idea that HP no longer belongs to Rowling, but belongs to the fans.
Now to be clear, I've seen these sentiments echoed elsewhere. The idea that creators "owe" their fans, and that the fans have joint ownership over an IP. We saw this with Star Wars for instance, and that line of thinking is part of why we got drek like Rise of Skywalker. Now, the post-Deathly Hallows works have managed to be lacklustre on their own (Cursed Child, Fantastic Beasts, etc.)
In practice, this thing has always gone on, and it doesn't have to be through the lens of some "ism." The Jackson films removed lots of stuff from the books, but is that because Tom Bombadil is problematic, or because the story grinds to a halt when he's encountered in the books? Want more LGBT stuff? HarryxDraco is a popular ship on ff.net. Want more POC? Well, OCs are a thing, or if you're into Deviantart, you can alter the ethnicity of the characters (black!Hermione was a thing before Cursed Child in fandom). None of this is an issue. I've done stuff along similar lines. But I wouldn't think for a moment that I 'own' the IP.