To me this reads like one of those bad jokes on the expense of trans people in 90's media. Like how Ace Ventura has sex with a trans woman, then only after he learns it, he starts gagging and washing his teeth religiously and like pumping his face with a plumber; it's hypocritical. You already enjoyed it, now you've learned something about it, it's suddenly shit and retroactively changes your previous enjoyment to disgust?

Perhaps you never liked HP, but practically the entire world did, before we knew how JKR will turn out. I'm not gonna give her a cent and previously used money for any HP related things like... 20 years ago, but I'm also not going to pretend they weren't meaningful to me or that her politics will retroactively change those feelings.