To help me get back into shape, I recently started commuting on my fixed gear to and from college summer classes. I was riding behind a guy on a Trek 1200 road bike with aerobars, but he wasn't using them. Like me, he was probably commuting from class since he had a backpack on and was wearing khaki shorts. Anyways, I was following him for a while waiting for it to be clear to pass since we were on the road's shoulder and he was going kinda slow. When it was clear, I announced my passing and went ahead of him. A 10 seconds later I see him zoom past me on his aerobars. He then looked back at me and gave me a big nasty smirk and hammered away like it was a huge accomplishment beating someone on a fixed gear and not even racing. Is this common to have commuters like this?