Proper ettiquette and manners

I am kind of pissed at the behavior of my co-worker yesterday. I was politely waiting for my supervisor to finish the conversation he was having with another worker. ( standing there beside them). I wanted to ask a question but didn't want to be rude and interupt them. Another co-worker just walks up interupts them. I politely tell him, " hey I am, kind of waiting to ask a question". He gets mad blows up....and says " well speak up, I don't know and continues to tell at me". This guy is furious at me.

I feel like I was being polite and he was just plain rude. Your opinions???? What would you have done?