"Cultural Appropriation" censorship

A literary agent I'm acquainted with recently posted "we're getting wind that publishers are extremely wary of buying diverse books by "non-diverse" authors because they don't want to deal with readers' accusations of cultural appropriation."

If I can only ever write white male middle-class characters in my stories, I will kill myself.

It's just plain bad art too. I remember reading a book where every character read like a middle-aged Canadian male, (yes, including the teenage girl and the alien intelligence) and I was bored to tears. I want multiple perspectives from various people in my novels, and most of them will not match that of the author.

And do the people pushing this not bother thinking about the consequences of their own agendas? If gay authors can only write gay characters, women authors can only write women characters, black authors can only write black characters, etc, this hurts everyone. There will be less interesting fiction to read, and far fewer stories that any author can tell. How does it help women authors to tell Anne Rice that only men are allowed to write male POV sections?

Ugh.