Some maybe, but reading these threads and general comments it strikes me there is a lot of projections going on. It's usual same old "I stopped at a light all full of wonderful feelings, and this guy on his fancy bike didn't say hi back!" or "that one cyclist didn't wave back!" Clearly he/she is elitist blah, blah, blah. Maybe they just didn't see your wave, or by the time it registered you already passed, or maybe they are just not very social and it's stressful for them to engage in small talk, etc.