I agree with the comment about the riders covered in logowear. They are usually too far above my level to even acknowledge that I exist. My pet peeve about my local club is that 95% of them are on road bikes and when I arrive at a club ride with my hybrid, I swear they look me (and my bike) over and sneer. Maybe I'm just paranoid because I stick out (not only do I ride a hybrid, but I'm not a thin, sleek cyclist, if you get my meaning). And finally, I think many people are attracted to biking because it is something you can do by yourself and don't need anyone else to do it with you. Those same people maybe don't like to interact with large groups of people and then come across as unpleasant.