Rowling has “fuck you” money. She isn’t an ideologue. She’s basically somebody who went into stasis as an individual once she crossed a certain financial threshold. Right now, she’s pissed that people call her names, so she is fighting back, and doesn’t give a shit. She made Dumbledore a fag for whatever reason she saw fit, so it isn’t as though she has a problem with faggotry at large. She’s just angry at the way the troons are treating her. For now. She’d respond similarly to conservative Christians if they made personal attacks against her.