In grade school, Wyatt/Nicole of Becoming Nicole ran into difficulty when a boy (egged on by his grandfather) insisted on using the girls' room if she did. The whole debate to me was very gratutious -- a transgirl using a stall is a threat? Adult bathrooms might be complicated. Isn't even the matter of a transchild using a boys' room where there are urinals. The issue of showers is complicated (she changed in a stall). This was not. "Don't sneak" is good advice.