Yep, she's one of the few women in the world who is completely uncancellable.
It's a potent combination of extreme wealth (so they can't threaten her livelihood), a previously unimpeachable record of supporting progressive politics (so only absolute imbeciles actually believe the attempts to smear her as "far right"), the ability to express herself with absolute clarity, and total fearlessness.
So many women have dipped a toe in the water saying, "Hmm, I'm not sure I quite agree with all of this" (for example, Margaret Atwood, Dawn French, arguably even Simone Biles) and moderated their words as a result of the backlash.
But JKR just doesn't negotiate with terrorists. She's like, "I realise you are upset, but I did mean what I said and I'm not going to apologise for it. And I don't need to educate myself, I already have which is why I believe what I do."
And the misogynists HATE it. She's the one woman they can't bully into submission.