This is my first year of road riding, and I have felt the same way at some rides, but others (within the same bike club) were very casual, even though the riders were just as fast (from my perspective behind them). I've never noticed any snobbery about someone's bike at any ride (other than the good natured ribbing I get for riding a triple). Heck, one guy rides his hybrid at the same speed as the rodies and is treated as an equal by them even though he's riding a mid-90's steel hybrid with toe-clips.

I definately notice people (well, the bikes actually) who ride really nice rides before the fat-tires, but that's the same thing as the ferrari situation you mentioned above. I agree with the others that you should just keep looking for another group of riders until you find one that is more accepting.

FWIW, the group of snobs I ran into was on a "fast" ride, so the paceline trust issue might have been what I was experiencing. It doesn't bother me, because I DON'T have the skill to ride in a paceline, which is why I hang off the back (1 bike length) of the last guy in the paceline until I get dropped.