Should I be worried? (Being stalked?)?

[SUN]

A few days ago while in my dorm room, some people in the hallway were being extremely loud at about 2-2:30am. I opened my door to see what was going on, and someone in the hallway walking to their room looked at me and said "What the **** are you looking at?". I went back into my room without replying. The next day, I received a friend request on facebook from that same person, and found that the name tag on my door was missing (which must be how they found my profile...I don't have a very common name). I immediately blocked them. Should I be worried about this and inform a manager or call the police? It seems kind of freaky that someone I've never even met would take the time to look me up on social media for something like this and respond with such hostility for simply looking in their direction.