Very handy..
Your daughter comes home on Monday saying she is a guy. If you refuse to acknowledge it, you lose custody of her, er, him. Then on Wednesday, she decides she is a girl again. Watch your pronouns, Cis dad! Or Woe unto you!
How is it handy? Well, you need to pee and the men’s room is closed for cleaning. Well, at the moment and there is an open woman’s room ready for a tinkle! Viola! I am feeling like a woman!
Funny you should mention that. A while ago I was in a Wendy’s and I really, really had to go. The men’s room was occupied, so I identified as a woman for the few minutes necessary. Of course I locked the door so as not to offend any cis woman. As soon as I came out, I went back to identifying as a man.