What kind of male, transwoman or not, wants to get their penis out at all in a place where they know women and girls are expecting it to be a female only space and may well be uncomfortable at the sight of a penis, whether it's intentional or not?
Well, up until last night, I would have said that surely males who identify as females would respect female's enough to not do this.
Then on another thread last night we were told by an activist that even if the law changed and the toilets became single sex, "transwomen will keep using women's toilets, despite the law, because they'll assume that it's their right to have a pee without being beaten up."
But then that poster also said that it was women who were beating transwomen up with great regularity. They did acknowledge that flashing of penises seemed to be an undeniable issue though.
So, I think it depends on who you listen to actually. Some prominent people on twitter have also stated that they don't care about the rights of women, that they will simply keep using those facilities because they feel it is their right.
So, yes. There does seem to be a group that simply will do it because it is 'legal' and without any care of the distress it causes women and girls. That the needs of women and girls don't matter.
That is also where the 'unintentional' exposure argument fails. Because it simply matters not a jot to those using it that women and girls will be harmed.