On April 10, 2024, Rowling wrote about the Cass Report on X (formerly Twitter), revealing that it had some disturbing findings on transitioning children: "Over the last four years, Hilary Cass has conducted the most robust review of the medical evidence for transitioning children that's ever been conducted. Mere hours after it was released to the press and public, committed ideologues are doubling down."

A user named Adam Harris responded to her and said, "Just waiting for Dan and Emma to give you a very public apology ... safe in the knowledge that you will forgive them ..."

The author responded and suggested that forgiveness is out of the picture for both actors. "Not safe, I'm afraid," she said. "Celebs who cosied up to a movement intent on eroding women's hard-won rights and who used their platforms to cheer on the transitioning of minors can save their apologies for traumatised detransitioners and vulnerable women reliant on single sex spaces."