Colin steps into a crowded elevator. after selecting a floor, he turns around and faces the back of the elevator. after colin gets off the elevator, one passenger remarks to another, "what was wrong with that man? doesn't he know the rule that people in an elevator should always face front? " this remark best illustrates the for abnormality.

I believe the answer is: norm violation

Norm violation refers to every actions that are not accepted by the majority members of a certain society. For most cases, norm violation usually do not resulted in direct legal implication for the actors, but would almost certainly resulted in negative perception that's given by other members of the social group.