So, I'm entering the building on my way back from lunch. As I come up to the glass double-doors (which open outwards), I see that there's someone (at a glance, a nondescript middle-aged guy) inside, just about to come out through the same door.
Being the kind, friendly, and all-around wonderful person that I am, then, naturally I open the door and step to the side, holding it to let him through. He, head down and peripherally noticing that the door has opened, stops to let past the person he presumes is about to come through. After a moment, he looks up, sees that I'm holding the door for him –
– and steps up to the other door, pushes it open, and goes through.
Certainly I can understand being intimidated and even ashamed by my irrepressible masculinity and selfless generosity, but I promise, no one would think less of you for walking through an open door.
(And no, there wasn't anyone behind me he might have mistakenly thought I was holding the door open for, nor was the situation such that he figured he'd go through the other door to avoid inconveniencing me. He knew what he was doing: he was saying "You're holding the door open for me? What a jackass. I'm going this way, now, lest I inhale your freak-germs or accidentally acknowledge your existence. I hope that door handle gives you rabies.")
It must be lonely and sad to be so angry.