It can't find out anything about gender.
I respectfully disagree. I count all fields of research that study human behaviour as science, too, and those fields of science can find out quite a lot about the many interesting, yet ultimately harmful gender roles human societies constructed over the ages.
Biology cannot find out anything about gender, though, I quite agree with that.
WildernessWhale is talking himself into a corner, pretending that forcing women to share intimate spaces with males isn't putting women's safety second to male feelings. (It totally is. Wanting to force women, by default, to undress in the presence of males, is sexual violence, and nothing less.)
And to top it all of, trying to accuse feminists of transphobia when a transwoman on the thread asserts that there's no transphobia here ... it would be funny, if this sort of attitude wasn't so common, and if it did not actually harm girls and women. Severely.
WildernessWhale, how many girls and women have to be raped until you admit that you are wrong? Is one enough? Two? Three? Say, how many have to be harmed, until you admit that males WILL identify their way into women's facilities to rape girls and women?
Or will you try to force them to say they were raped by women, even then?