Although I do feel a bit bad about snapping at SweetPetrichor - at least they seem to be being honest and making the "what about the men" argument rather than pretending transwomen are somehow distinct from men in general.
I respect that, and it is a sane discussion you can have. Is there sufficient provision for each sex, what sort of provision do they need? (There's no reason to assume it's symmetrical).
And maybe there should be some mixed-sex provision, for various reasons. I'm not hardline to say all provision must be single-sex.
But I am hardline to say there must always be single-sex provision for women. And what we see is activists desperate to totally stamp it out. And when they've nearly succeeded, so they're down to one single-sex shelter in a city, like Vancouver Rape Relief, they go totally nuts.
So in general I still don't really buy the honest-seeming "what about provision for men" argument, even if that's what SweetPetrichor thinks they're supporting. What we're seeing here is the attempt to eliminate female-only provision. There's a motte-and-bailey thing going on here.
As Lachlan Stuart wrote about - for the core activists it's not the provision of trans (or men's) rights that interests them, it's the elimination of women's rights.