I want to caution about reading -isms into authors works. People often don’t really know their own stereotyping unless it’s pointed out (you, dear reader, probably have some problematic world views that no one has noticed or mentioned…). The fallout afterwards is where the problems exist, when someone doubles down on their viewpoints after being informed of them.
Rowling has clearly done that and is dismissed because of it. I will avoid things that give her a platform, and the original art itself is tainted due to her continued stances; but, back to the general case, just because art might be racist or antisemitic, etc., at the time of creation, if the artist can be convinced that their views are wrong, we should celebrate that – just with footnotes and context.
I was certainly not defending her. She is, as you say, egregious in part because when she was called out she refused to reflect. I was more talking in the general sense. The world sucks right now, but we are quick to attack people on their views without granting them opportunity to change.
I call this out because of the trend of ‘leopards-eating-faces’ kind of jokes. When the leopards eat your face, you might notice they were not friendly to begin with and the rest of civilization can welcome you back instead of mocking you; or they can mock you and you will feel isolated and defensive and the other bigots will welcome and validate you instead.