because it is factual, not irrational? if i see someone walking down the street with a bloody battle axe, my suspicions may peak? The point is that i treat everyone alike. Regardless fo what they are wearing, what color their skin is, etc etc. Again: racism is not to be confused with active cogniscence. Using inputs to determine course of action is what staying alive is all about. But when you let such assumptions directly effect your output, then you have taken something acceptable, and violated it.
And, mike, you are better than dick and fart jokes.