It's like that on the ham and GMRS repeaters here, too, particularly 462.650 which is, incidentally, channel 19 on GMRS. People are helpful and polite. It's just how we roll. I'm not trying to knock on CB folks, either. There ain't a thing wrong with CB at all.
Some of us have moved around a bit and you can tell those because we'll converse with people who are blunt and to the point, smile, and wish them a good day. Though every bit of that is genuine from both parties, people they know from around here will be like, "that guy was *rude*." Well, no, he really wasn't, he just acted the way they do where he's from.