That's kind of an individual thing. Like, I get it, I get what you're saying, but, when I think about the books (which I used to love), I just didn't think of them fondly anymore; I can't think of any of those characters without that irritation and disappointment coming up.
I was super excited about having my kids read those books -- and my oldest started the series, but then needed a break to mature a little before hitting book..3 I think? Idr. And now I just don't really care whether they read them. (If they do choose to read them on their own, I won't tell them about JKR until after they've finished them.)
However I have no problem setting aside the shittiness of Knut Hamsun or Henry Miller; I still really enjoy their books. Heidegger? Too shitty for me. Picasso: meh, he's fine.
That's My Hot Take: if it bothers you, acknowledge that, and don't force yourself to be uncomfortable. But also don't shame people for whom her toxicity is something they can set aside.
(As long as they are setting it aside and not enjoying the work because of her toxicity.)
That said: pirate her shit, you don't need to give her money.
Tbf reddit used to be a lot more lefty. Back when Shit Reddit Says was the dominant subculture it was a lot of fun... But then Steve Bannon wanted Trump to be president and SRS lost the war against red hats and bots.