When I ride my beater bike to the grocery store I see a few "roadies" in their full gear and nice bikes, but they, like me, are pretty absorbed in not getting run down in traffic. I don't wave or expect a wave; I guess I would try to respond to a wave or a nod tho.
As in any arena, knitting clubs, cycle clubs, or about anywhere, there are going to be snobs, extremely shy people and those who are completely dense. Hard for me to tell in 15 seconds while passing someone who is who and what their motives are.
Being older, if not a tad wiser, I go out of my way to try and be nice and encouraging to any riders who may be new to riding. Life is tough and being a bit friendly doesn't cost much.
If I was in distress on the side of the road or stuck I would not hesitate to flag down the first rider or pick-up truck and ask for help, stopping short only of tossing out a tire punture line. I think it's expecting a bit much to have someone "know" I need help and stop on their own. My DH and I can't even read each other's minds to know when one of us needs something, kinda tough to expect a complete stranger to do the same.
I'm still new to cycling and in love with all on two wheels. I'm sure I'll become jaded and critical of other cyclists -- just give me time :D

