I think this is a far bigger issue than who pees where. It is at heart whether female people are allowed to have any social, legal or political existence in our own right.
I think women are half the human population and we matter as well.
I think anyone who thinks it's ok to decide the thing that makes men and women different is our minds not our bodies is (a) sexist as fuck, and (b) still hasn't actually given an argument why the people who do have female bodies can't also be recognised and supported in our own right rather then being lumped together with the "womanny-minded" people.
I think any politican who truly believes the above is a sexist fool, and any politician who doesn't truly believe but makes the statements he thinks he needs to is a craven snivelling opportunist who has just shown the world he will throw anyone under a bus to get what he wants.
Either way, certainly not a man that women should vote for.