It's about how we organise, not "policing"of anything. That's a pejorative term, which I suspect you wouldn't use to describe other aspects of anarchist practice aimed at protecting traditionally oppressed communities (in this instance, females). That's because you're (wrongly) conflating gender critical anarchists with other gender critical people. It's quite possible to want to guarantee safe spaces without appealing to the state to provide them. Indeed, that's what the current bookfair is aiming to do for trans people! Gender critical thought is not a monolith. It's quite possible to address gender from an anarchist perspective without necessarily believing that there are no differences between women who are trans and women who are not, and the way we should respond to that fact. But this issue is relevant to the subject of this thread.