From time to time in various threads we discuss newbies or Persons on Bikes verses Cyclists.
Now while it may sound elitist to separate the terms... in reality there is a difference between a cyclist and a POB. Much of it comes down to the learned skills of how to deal with traffic and how to use a bike.
Here is a little blog from Dave Moulton who writes about POBs.
It is worth reading and discusses some of the fundamental differences between cyclists and Persons on Bikes.