Have you ever noticed, when an elevator is occupied by one person and the doors haven’t yet closed and you are running to get the elevator before the doors close so that you will not be late, how the elevator occupant stands near the back of the elevator, as if to suggest, “Well, I wasn’t close enough to the panel to hit the DOOR OPEN button,” should you run into this person later? 

In short, this type of elevator occupant clearly wants the elevator to himself.  But what’s funny is when you somehow manage to get inside the elevator by way of tripping up the sensors and you give the elevator occupant a smile and a how’d’ya’do, and the elevator occupant is momentarily ashamed by his rudeness, which you are now both aware of.  There’s no apology or anything.  Just stunned silence. Of course, the elevator occupant practices the same rude behavior the next time you see him.