Beating People on the commute who have a better bike

I was raced yesterday. I say 'raced,' but only one of us was racing and it wasn't me.

Almost home after a 50 mile, very hilly ride and a guy in mountain bike gear (baggy shorts, jersey, spd trainers and helmet) riding a base model Specialized road bike (brand new - C2W?) decides to ride up the inside of me, look at me and then cycle off.

I get to the next set of traffic lights where he's stopped at a red and he's sat there looking all smug over his shoulder waiting for me to arrive and then he says (whilst panting like a dog and sweating like a fat man) 'you might have all the gear but you can't fucking cycle very fast, can you?'

Is this normal behaviour once a hairy leger gets hold of a road bike?

What a pr!ck... These are the kind of biggots that undertake lorries and then complain that its the drivers dangerous driving.