But he isn't really a woman. That's Jackie Green, and he used to the toilets that accorded with his sex.
Jackie Green no longer has a penis and testicles; his mother flew him, when he was 16, to get a procedure done outside Britain because the procedure is illegal for minors there.
Now, my stance is that bathrooms have been (historically) sex segregated. If they are instead to become gender-segregated, who is going to do the gatekeeping? Your answer might be 'nobody', in which case there is no sex or gender segregation.
Most transwomen do not have bottom surgery, so they have a penis and testicles. (Indeed, some transwomen very vocally tell people who don't believe them to be women to 'suck their lady dick'. 'Suck my dick' is the kind of vulgar, sexualised utterance feminists usually call 'toxic'--if it comes from a cis man.
Alternatively, metaphor might say that he is ok with both women using men's facilities and men using women's ones. But then that would not accord with what I think is his position on trans men and women.
My whole point in this is to ask (and explore the reasons) why, for example, trans women, should not be freely allowed to use currently segregated women's facilities of these sorts (toilets, showers and changing rooms).
Unless I'm wrong and metaphor has no issues with that.
Because there is a difference between transwomen and women. Transwomen are men, they tend not to pass (in my experience), and if they do pass outwardly, the spell is broken when they take out their lady dick.
For me personally, while I don't want to see transmen in the men's, since they are women, I would not feel particularly traumatised or in danger or that uncomfortable. Hell, I know some men who are so femme they sit down to piss anyway.
But I feel (and the focus of debates shows this) that some women and girls don't want to see men in their toilets and changing areas, even if these men are transwomen.