Cyclists ride. They do not drive. Drive implies you aren't the prime mover in the mechanism (i.e., an engine is doing the work, and you're merely performing the task of executive signaling and control to that set of movers and systems carrying you along do so. The inflection point is actually legal in nature; in that once you slap a motor on it, you require licensure, because you're driving now. This is also why I disagree with driving being a privilege granted by the State; I'm not big on large edifi telling me I can only utilize mechanical devices at their whim, but such is life, yes, I've had the argument before, no I'm not going into it now).
A cyclist, however is the mechanism. You can make the argument that it's silly, but I'll bet you more people will look at you funny for saying cyclists drive than for saying the operator of a motor vehicle rides especially given the legal baggage that comes with driving.
Aside from that, they're quite easy to identify. They're usually the ones either breaking traffic laws, or being ignored/cursed at because their mere existance increases the volatility of motor vehicle traffic patterns in urban environments.