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.
... Interesting.