I've noticed that a lot of bodybuilders are full blown social retards, no normal person would go getting upset at 'civilians' making smal ltalk. When someone asks you how much you bench press its an implicit compliment because they think you are big and they want to talk to you about something they think you would be proud of (unless it's followed by the retort of "well, my brother/HS coach/old boss could do twice that much and he was twice your size")
denying AAS use and fcking with someone telling them 'I only take creatine' is fine, being a holier-than-thou douchebag and getting all Lance Armstrong about your denial is unacceptable and grounds for a kick in the balls