Why not educate them if it bothers you that much? Just coming out with snobbish and condescending remarks and looks is pretty poor behavior.
Your story read to me.
"I was sat with my girlfriend when this guy walks by looking happy with his new bike. He smiled at me but I looked at him like the piece of shit he was. After he saw my bike he really new how crap he and his bike were."
Sure the guy is ignorant sure he made a bad purchase. Thats all. It's not that big a deal. Your acting like some sort of teen American college alpha, beta house thing look down on everyone else not in your club.
+1