Critical gender theory, despite having theory in the name, is a political ideology. It is not science, and in fact includes a great many claims contrary to biology.
As such, Dawkins is not denying science here. He knows what constitutes science better than you do. Trust the experts, as they say, not your own internet research.
Now, if disputing the beliefs of trans people concerning gender constitutes an attack on them (even violence according to some), are you attacking creationists when you dispute their beliefs concerning biology and the age of the Earth? Are you guilty of violence against them?
Presumably, we both agree creationists are humans. We cannot, should not erase or invalidate their feelings, their validity and personhood. It hurts their feelings and invalidates their identity when we commit epistemic violence against them, which is to say, disputing beliefs that are central to their identity and sense of validity.
Must we all then humor creationists? Must we never say anything which contradicts their timeline of the Earth and living things, or we're guilty of violence against them?