Why bother?

Ok.  So today I was walking down the corridor at work with two carrier bags dangling from my right wrist full of food and in my hands I was carrying a heavy laptop, laptop cables, remote controls and a huge tray of food, one of my bosses walks through a door I'm heading towards, lets it close in my face and I'm standing there thinking to myself, ok, alright, I'll glide through the fu**ing thing shall I!  Or maybe do a Rentaghost and just appear on the other side of the door.  No apology, no nothing.  People are so rude - so why am I surprised?