I agree, and I do not understand the folks that seem to be insulted when you asked them to call first. I'm single, live alone. Hell I could be in the shower, other bathroom visiting, napping ? ....Why is it an insult to ask for a heads up?
A few years back, I was in the middle of one of those bathroom visits when a friend stopped by. I couldn't answer the door. When I finally did, he seemed all incensed when I said , man wish you'd call first.....I hate 'rushing' a body function.
Another time a friend stopped by, I had just returned to get tools , helping another friend repair his garage door. The friend stopping by got 'pissed' when I didn't have time to socialize.
I don't get it?