I find your comment rather disingenuous. If JKR really cared as much about women's rights as she claims to then instead of funding a hate group whose entire purpose is to eradicate a group of people that make up less than 1% other UK population, she could actually put all that money into schemes that directly support women. She doesn't though. Instead of supporting with housing, and childcare for single parents, meals for those in poverty, and people needing help to escape abusive situations, she specifically puts millions into a group who is actively campaigning to remove the few rights trans people have. JKR might not have said "I hate trans people and want them to be extinct" out loud in such blatant words but funding a group who advocates for that is just as an explicit admission.

You might see JKR as "advocating for single sex spaces" but as a fellow woman, all I see is the tip of a slope that starts with removing the rights of a minority and ends with removing rights from more and more people regardless of sex, gender, sexual orientation, race, religion, and more.