If you offend JKR, she'll act as if it's no big deal and then write you into her latest novel where you starr as a pedo paedo sex corbyn or smth like that (Robert Galbraith is the pen name she uses when she writes transphobic detective stories).
She had an anti-semite character who was a stand-in for Corbyn and had a Hezbollah flag in their room......which like that last bit is honestly based and cool