Hmm... Haven't. Though since the third time when I was told by a man I had the wrong bathroom, I'm always at the women's if there's no unisex bathroom... assuming it's not too full (or so full I wouldn't be noticed). In which case I avoid the bathroom altogether.
Honestly, not having socially transitionned yet and having zero self-confidence, I've been pretty much fleeing enough to make such an occurrence pretty much a miracle.