daniel radcliffe calling out j.k. rowling on her bullshit is big dick energy
One thing I have not seen mentioned in light of this statement, perhaps because it's just well known or perhaps because it's been forgotten, is that Radcliffe has dealt with this before. About 10 years ago his friendship with a trans musician named Our Lady J became known to the tabloids. They immediately published sensational articles calling her a transvestite and a drag queen (she was not), and speculating about the nature of their relationship. He responded to insinuating questions by simply being aggressively positive about what a great musician and good friend she was. They did at least one interview together for a queer magazine. This at a time when trans people were even more marginalized than now, and when he as an actor was finishing Harry Potter and under a lot of pressure to ~manage his image~ as he transitioned to an adult career.
TL;DR - Radcliffe has a record of not just saying nice things, but supporting trans people in his life.