Most public bathrooms have stalls equipped with doors. Doors are a funny thing. Closed, they're a wall. Open, they're nothing. If a door's proper function is as a wall, there;' a certain etiquette. If a wall, it has meaning; and intended separation: one is within walls, or one is outside of walls. Walls define inclusivity. Outside, etiquette says, you're not included. Is that clear enough to sentient people? To polite people?
Agree or disagree with Kyrsten Sinema, there's a certain toilet subtlety that escapes some people; kind of like trusting that flatulence is all that will escape. In public, that may be a little embarrassing, and there's a certain etiquette about that, as well, because, well, everybody does it, don't they? The invasion on Kyrsten Sinema was effected by someone who understands none of the above. and we're supposed to think they have relevance? Sorry. All I hear is a toilet flush on that etiquette.