4 yr olds aren't known for their patience. Well, at least mine isn't. Nor was he known to be loaded with common sense then either.
Oh well, at four I probably did the same thing. Shorty was talking about someone who was an adult, or at least at the age of reason.
SAM:
Depends, what if someone is vomiting blood? Would you consider that as an invasion of privacy?
Does it require a knock?
No, of course not. We had to bust open a door once because my friend had passed out in the shower and we were afraid he'd fallen and knocked his head.
Besides, mom never locked the bathroom when she showered, so it was never a big deal to just pop your head around for a question.
Eh. It depends on context. I ran around naked all the time when I was a kid and my parents didn't think much of it. I still skinny dip if I can when camping - my swimming suit is quite ornamental and more designed to look cute.
But I would find a family where the parents were naked in front of their children to be a bit odd. Something to do with being conscious of your body as sexual.