I thought it was funny.
As far as supporting JKR goes: JKR is a horrible person who no-one should listen to but Harry Potter is pop culture. I’m pretty comfortable personally with disconnecting the two in my head. I don’t think people enjoying Harry Potter should be seen as “supporting JKR”, hell a lot of them wouldn’t even be aware of JKRs noise.
Obviously I haven’t read the comments here a ton but are people really supporting JKR or are you just treating people enjoying Harry Potter as support for JKR? I think there should be a distinction. It’s not really people’s job to deep dive into the personal lives of the creators or people involved in every piece of art they enjoy.
Oh right, I was not aware of JKRs comments on funding anti-trans organisations. I guess my point still stands, I.e. that people often don’t have deep insight into the creators of the art they are enjoying, so considering liking Harry Potter as a statement about their feelings on the author doesn’t resonate with me but I understand why you’d have issues with it with the funding comment in mind.
Entirely agree on liking Andrew Tate being a red flag in the same way liking JKR directly would be a red flag. It’s more liking the books that JKR put out years before anyone heard her potentially rotting brain driven opinions on trans people that I don’t think should be seen as a red flag without at least some questioning about their thoughts on the author.