Note that Rowling is very well aware of the issue. She in facts condones, nay, applauds it

In the scene, a trans woman, Pippa, follows and tries to stab the protagonist, Cormoran Strike, before getting trapped in Strike’s office. After demanding Pippa’s ID, her trans status is revealed and her visible Adam’s apple is noted, while it's noted that her hands were jammed in her pockets. Pippa tries several times to escape the office before Strike finally says, “‘If you go for that door one more time I’m calling the police and I’ll testify and be glad to watch you go down for attempted murder. And it won’t be fun for you Pippa,’ he added. ‘Not pre-op.’”

https://www.vice.com/en/article/pkeynz/jk-rowlings-transphobia-wasnt-hard-to-find-she-wrote-a-book-about-it

It's especially obvious when they also scream about trans women being incarcerated in women's prisons. Then the evil transes are going to rape and pillage the poor, defenseless women prisoners, apparently.