This one (among others) does really fascinate me. Maybe it’s due to spending a lot of time around diverse groups of people but I’ve never really seen a huge distinction between these words. Washroom, bathroom, toilet, I and everyone I know pretty much would use interchangeably? Or at least wouldn’t blink at someone else using them.

Restroom, and a variety of others, might be slightly more usage specific but still… wouldn’t be unexpected or weird, I’d say?