No, I am saying they don't get to piss in the women's room because they are men. They can use a urinal. A woman can't.
They are not men. They don't feel like they are men but you're forcing that identity on them due to a piece of flesh.
They are men. You can put them in a dress, staple on some fake boobs, and put them on their knees with a dick in their mouths, they are still men.
Man is not their identity, woman is. They are women on the inside and should be treated as such, whether they choose to surgically alter the flesh in their nether region or not.
They can be a woman "on the inside", but when their outside needs to piss, they are men.
That's a really arbitrary requirement.
Besides, women do more than urinate or defecate in the ladies' room. It's where they go to fix their hair and make-up and is the occasion for which they really dress up, as they exchange compliments there. Denying a transwoman that right is essentially denying her womanhood just because of a piece of flesh.
Personally, I avoid public restrooms of any nature like the plague, so I only know most of this from what women say.