'Spaw gives wise advise. To respond to trolls is to reward and gratify them, thereby reinforcing the behavior. To ABSOLUTELY ignore them will 1. extinquish the behavior (least likely outcome) or 2. extinquish their interest in this website (most likely outcome, and good enough for me.)

Even posting about them, as I am doing now, is reinforcing the undisirable behavior.

It is well established among behavioral therapists that intermittent reinforcement of a behavior is at least as supportive of the behavior as constant reinforcement. So... IGNORE,IGNORE,IGNORE!!!!