[Dylan16807]

Well in this case, imagine if he didn't say that, or say anything. It would be pretty rude.

[akerl_]

If I go for a jog, and a bunch of people start jogging behind me that I didn’t solicit in any way, then no… it is not rude of me to just stop jogging and go home without saying anything to them.

[Dylan16807]

If you spent many hours, days, months with them it would be. Come on.

[akerl_]

Why? Why does doing something in public for a long time create an obligation to people who see me do it.

[Dylan16807]

They're doing it with you, so you should at least say goodbye.

I don't know what I can say for "why" other than go find a manners book and a philosophy book.

[teddyh]

Exactly. A modicum of respect is all I expect.