busier than you

It only took one phrase to piss me off.

I have this friend who studies abroad, and is currently back for holidays. So that day I was doing stuff on my computer and he msned me. He was asking if the few of us would want to meet up or something, and I said I might be busy, then he popped me this line, saying another of the friend is busier than me.

I was like, what the? What makes you think that someone else is busier than me? What makes you think that I am more free than someone else? So if the supposedly busier guy can meet you, does that mean I am obliged to do so too?

So I showed him how busy I was by signing out of my Windows Live Messenger.