To think being around other naked people is creepy seems to fit the bill (not faulting you, but true).

Trying to equate taking a dump in public with using a common shower is very much considered prude. Of course the stigma attached to the term plus the subjectivity involved makes it fuzzy.

There's also nothing about unsanitary about public defecation. On the street, yes. But a toilet or latrine is no less sanitary when you take the walls down. It's just not private any more.

But some of those generations would be creeped out by women wearing pants and short skirts, men wearing jeans everywhere, and people talking openly about sex and menstruation.