Sometimes people are assigned progressive by social expectations and start playing that role without really thinking about it. She tried to write an apolitical generic kids book, and everybody's white, fat people are evil, and bankers are big nosed goblins. Then other people read it and started pointing things out, but she couldn't detect any of this herself so when she tried to be inclusive she just added Ching Chong the asian and a minstrel slave race. Need to make someone black, I said Hermione has ugly frizzy hair so I guess it's her. Need a gay, make it the asexual grandpa so it's not gross. Eventually something comes along that cracks their assumption that they must be progressive and they come out as right wing on Twitter.

Not sure if you know this or not but black Hermione wasn't a canon claim like Dumbledore. People were criticizing the casting of a play and she was defending the actress, saying "Hermione can be a black woman with my absolute blessing and enthusiasm."

Imo the worst of the canon claims is that wizards would shit themselves and then apparate it away instead of developing toilets.

What’s weird is prior to the meltdown over trans people she was obnoxiously progressive

Sooo... just your bog-standard liberal "progressive" that jumped onto the fascism train as soon as the status quo was threatened in a way she doesn't approve of?

Funny, that.