The idea that Trans-Must-Have-All-The-Rights makes sense if women don't exist.
Try the thought experiment of making women completely invisible, inaudible, just totally and utterly Not There. A bit like the elves in Hogwarts. They live in the wainscotting and do the housework, but Real People(tm) don't have to notice them.
In that world, denying trans people, well, anything really is just stupid or mean spirited. "Nobody" is hurt by it.
That's the world the tiny minds live in who can't see what we're wittering on about.
Mary Leng had the perfect poem expressing it:
I'm nobody! Who are you?
Are you nobody, too?
Then there's a pair of us — don't tell!
They'd banish us, you know.
I thought I might be somebody!
They tell me I was wrong.
For no one was harmed in the race we ran;
I was no one all along.