My sister is a lesbian. She identifies totally as female because she’s not transgendered. She also plays a lot of sports so keeps her hair short (often in one of those girlie faux-hawks). She’s tall enough and with her athletic build, she’s gets guyed regularly. On several occasions she’s been blocked by bouncers on her way into washrooms in bars. As soon as she speaks and they hear her voice, the issue is usually resolved with an apology and my sister making a joke along the lines of “It’s okay, I’m a hockey player. It happens a lot.”
She has made no deliberate effort to “subvert societal norms” by taking on a male appearance. She just doesn’t wear make-up and keeps her hair short.
My girlfriend has short hair and wears no make-up for the same reasons (sports and because if she lets her hair grow she looks like Sideshow Bob). She gets guyed sometimes too and she is a straight woman. (My girlfriend has very feminine features, so that’s incomprehensible to me. My sister is tall enough and braod shouldered enough that it’s quite plausible for her to be mistaken for a guy, but really my girlfreind is too slight to look like a guy).
Even a really butch lesbian is a woman, identifies as a woman, and should use the women’s bathroom.
And if it was a man using a stall in the ladies room, so what? Maybe there is a good reason, like the guy was sick and had to use the john nownownow and coulnd’t wait for the men’s room. As long as he isn’t trying to peep or is exposing himself, and don’t actually see the problem.