Hello, never posted before, but thought this would be a good situation to ask you guys what you think. 

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A little background context before the story is that I go to a private college in the Midwestern states of the US. During my four years at this college there have been a number of reports of random people in the dorms. Some of these people would do things like: Steal, peak in on the girls bathroom, walk into peoples rooms, and sleep in the lounges. One of the big rules they tell us every year is to NOT let people you do not know into the dorms. I take this rule seriously because I would never know who I was letting in.

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Now to what happened this night. While waiting in the entrance to the dorm for my friend so we could go out to get something to eat. A guy (we will call him David) walks up to the front door and tried to open it. Now the doors are electronically locked and you need a fob to get in. David then starts pounding on the glass of the door to get my attention. I look up at him, but turn around and walk the other direction. David then starts pounding even harder on the glass. At this point his (I'm guessing) girlfriend lets him into the dorm. David then walks up to me, and starts yelling about letting him into the dorm. I look at him saying that I do not know him, why would I let him in? David then shows me a Tupperware container saying "Yeah I look like threat." He then says that I should let him in because he was "freezing his ass off" outside. For some context it is about 5 degrees out right now, but he was not out there for more than a couple of minutes. David then turns around and walks off with his girlfriend into the stairwell. During that time he was calling me an asshole and a "inconsiderate jerk."

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So AITA for not letting him into my dorm?