JKR has a history of being a proud anti trans bigot, not just donating money to such causes, but establishing her own NGO that is explicitly anti trans [1].

She is every bit as vile a bigot as Musk is, just with less (but still more than enough) money. And on top of that, her alter ego/pen name is male ("Robert Galbraith"), so it's yet another dose of bigotry on top - appearing as a male for... whatever reason, idk.

[1] https://www.advocate.com/news/jk-rowling-anti-trans-organiza...