It might be a roadie.
jdgang and I were comparing road vs. mountain shoes and pedals. This partially from Norms' podcast and partially due to newly acquired road bikes. jdgang said, "maybe roadies are pricks because of the shoes?" I support this theory, now that I have in fact ridden in road shoes.
1. You walk like a duck. This is unnatural. Unnatural things make you uncomfortable, and can readily manifest as anger.
2. Traction is poor when on foot. Gravity is not your friend. Mountain shoes are nice and grippy, and the wearers are happy, feeling connected and part of the earth. This may be why mountain bikes are generally seen as loose and cheerful, while roadies are grumpy and irritable due to their more tenuous contact.
3. 1 and 2 explain the last, which is the general behavior of road bikers. They can often be found lounging arrogantly about outside coffee shops, due to the dangerously slippery tile floors inside. One can only assume they sacrifice a single rider to make the hazardous trip inside. Despite their flaws, road bikers, much like army ants, are adept at working together.
4. Also due to the earth/shoe interface issue, road bikers hate to unclip. Therefore, they often will not stop at lights and stop signs. In addition, they will display aggressiveness towards vehicles, pedestrians, virtually anything that may cause them to have to potentially place one delicate bootie on mother earth.