TBH, I always assumed that the endless barging into each other in the bathroom and then looking all shocked and embarrassed was intentional in the coding, for humor purposes. (Apparently it doesn't play as such to a non-US audience, though!)
(For the record, I kind of wish they would cut it out, but the delayed overreaction strikes me as intended humor.)
I actually am from the US. Lol just considering females always seem to go to the bathroom in groups you would think especially in the case of twins there wouldn't be an issue. Plus it being a game where you can't constantly control where they go that they wouldn't get so uncomfortable and take so long to decide how to react. If I walked in on someone I'd just say oh sorry and backout closing the door. Then go right to another bathroom. I wouldn't be embarrassed and lose all sense of reason and direction.
