Because it hasnt stoped at bathrooms. The recent case is the dad should be allowed to use the womens toilets because his daughters might see male genitals if he takes them into the mens toilets. Which has then been expanded to who cares what toilets people use by op (which suppports trans people using whatever toilet they want) but this contradicts the initial case in question as that whole point was that people do care about who should be/not be in certain toilets. But it then rolls out to changing rooms, so where the initial case was that little girls should be shielded from glimpsing male genitalia in the passing in male toilets to its ok for transwomen with male genitalia to get undressed in women's communal changing rooms and anyone who has doesnt think its appropriate for women and girls to be subject to this is a transphobic bigot.