oldfixguy--
I see what you're getting at, but I just don't think it is as widespread of a problem as you make it out to be. Honestly, the only roadies I've encountered that are rude or snobbish are poseurs anyways.
It's funny because I'll wave hi to some guy out on the road, and he won't wave back. But then as soon as I show up to an actual crit or road race, everyone there is super friendly and coming up and talking to me. I remember my first crit race they marked me with a blue number so everyone knew it was my first race. Tons of those guys were coming up to me and giving advice/asking how I liked it/etc.
I will agree that triathletes (although dorky as hell) are extremely nice. My favorite group ride in Austin leaves from a triathlon store, and it's one of the only group rides that respected me when I showed up on my FG. Other shop rides will snub FG roadies, but the guys at this tri shop were totally down and thought it was cool.
But, like I said, i think (like everything else) it all varies person to person. Some roadies are very nice, some MTBers are snobs, and some tri-geeks are too focused on their HR monitors to even notice you haha.