It is a constant debate isn't it? Can you, should you, separate the artist from the art.
I quite like Harry Potter, i don't consume all the things though, i'm more about using the books as a bit of mindless comfort reading, ditto the films. But i know how hard it is when you have invested a lot of your time in really getting into something then the author turns out to be a real nazi, or child abuser.
In my case (yes Marion Zimmer Bradley, i am talking about you) I had pretty much read (and mostly loved) all the Darkover novels. But then i found out that she covered up and enabled child abuse, so there was a problem. She's dead, there are no more books to buy so her estate doesn't benefit from me re-reading. On the other hand, all the work is tainted. So i binned them. Literally dumped them in the paper recycling. Other authors - Dahl for eg - i have more of a problem in abandoning.
So the genderists need to decide if they want to consume the content, consume but purchase no more, consume and purchase and feel bad, consume and purchase and make a matching donation to a trans charity etc etc. But oh lord what i want them to do most of all is STFU about it.