This is a situation all crossdressers must definitely think through thoroughly well before going out. I have a cross dresser as a friend and he always try as much as possible to avoid the situation. He always try to find a place with a single person washroom, that way, he doesn’t have issues whatsoever. But there have been a couple of occasions where he had to use a multi person washroom. Fortunately, nothing of serious consequence happened. He just acted womanly, like she was supposed to be there. Women have their own “code of ethics” for washrooms and all other places and situations and to be truly a woman, you have to observe and study them. And definitely think like them. It’s a process to get rid of masculinity.