Originally Posted by ax0n

Coulda been an OCP (Obsessive Compulsive Poseur) however it's hard to tell an OCP from a spandexed roadie from a serious racer in the few seconds it takes to get passed by. If he passed you, it probably wasn't an OCP. Most OCPs I see around here are stuck in too high a gear on the most expensive of road bikes, but can often be passed BY a mountain bike. That is, if you're not a wimp that whines on the Internet about getting passed by another cyclist.

As a general rule, especially on the road vs narrower multi-use paths, passing in close quarters without announcing is acceptable. Perhaps a little shrewd, but acceptable.