TODAY IN ME AND THE DUDE AT THE FRONT DESK OF MY OFFICE BUILDING:
I guess he's "security". I walk into the lobby every morning and I never ever say hello. I avoid this by never ever looking at him in the face. I noticed that every other person does both (look and greet), which means that I am a snob. So I started trying to look at him to say hi, and he refused to look at me. For five days now. That means that he had noticed that I am an asshole and there is no way to change his mind, right?
I think I will just try to be more of an asshole to justify his assumption. Good plan!!