My commute is 8.5km right across the heart of downtown Toronto. What's way more fun than dropping random cyclists is dropping aggro white collars from the financial district. I really enjoy leaving a BMW or Porsche floundering behind me in traffic.
Maybe people are just blanking on the fact that there are a few different kinds of roadies. Would you brag about it if you dropped some dude on a touring bike? Probably not, but I don't see why people get all puffed up about dropping some random cyclosportif rider who has just as little competitive training. If you really want to talk **** about dropping roadies with your fixed gear bike, go enter a local cat 4/5 crit. Tear a few legs off and then talk.