Perhaps JK made some genuinely hurtful comments I'm unaware of, but given the ones that were quoted in a pearl-clutching context I'll believe that iff I see it. There is a school of thought that seeks to treat all trans-gendered or gender dysphoric people as a monolithic group who have only one correct course of action. The irony of that, given what gay-rights activists were working for within living memory, is so sharp as to be painful.