Okay, yes, im a Harry Potter fan, im also transgender
I dont in any way support jk rowling. I own the books from a while ago when i didnt know she was a terf (and half of them i got second hand anyway)
Since i haven't bought any of her other books and haven't bought any merchandise or anything that supports her
I just enjoy her series
She's a terrible person, yes, but a good writer.
I dont support her. I wont buy any of her work or do anything to give her money or support her. But i will participate in the fandom and enjoy her characters and works, because she can't stop me from doing that.
Other trans people, if you enjoy Harry Potter, get second hand books, make your own merch/costumes/etc. Don't do anything that helps rowling in any way. Don't buy the movies, dont buy her books, dont buy from legitimate shops.
But you can still be a fan, and that's okay
Of course i support people who dont want to have anything to do with Harry Potter and thats okay
Quick edit: i support you not wanting anything to do with Harry Potter but i dont support people hating on hp fans just because of the author