What about all the cis-depraved villains and cis-self-sacrificing? Depraved Villain and Selfless Hero are pretty much half of the main character tropes, along with Spunky Sidekick and Damsel/Dude in Distress. And I guess Anti-hero, but Anti-heroes are still pretty selfless, they're just less gracious about it.
TBH, until we get more trans*authors, it's probably going to take a long time to get better, because of Write What You Know.
I don't have any real comments about the racism part, beyond "I don't think that's quite what he meant by that." But it is pretty white-centric.
But the cissexism? Come on now. To say that counts as anything is like saying he believes everyone should be con artists just because Shadow was Wednesday's accomplice in American Gods. The Wanda Mann thing is a little tacky, I'll allow. A pretty tasteless joke. Maybe Wanda's not the main character, but then again Neil is a cishet and they say write what you know. And some of the artwork comments... Really, he didn't draw the thing, blame that on the illustrator. And there's even a bit where "Just because someone's different don't make them bad". I feel like the OP on that link might be trying too hard to take offense. Why is it offensive Wanda died, just because she's Trans*? If I recall correctly, and I can just go pull the comic off the shelf if I want to but I don't because my back hurts today, she laid her life down for a friend, and that's pretty noble. That's Hero Character material, to me.
But I think this is all things that we're going to disagree on forever.
You don't like Neil Gaiman? That's interesting, I've never heard of anyone that thinks of him as a "shitty person" before. He's one of my favorite authors, I really enjoy his work, so I'm curious as to if there's some dark secret I've never heard of. Not that I'll quit reading his stuff, I'm just interested.