On my into work today, I ran into one of these guys. Almost literally. He was pulling up to the intersection of NW Davis and 4th and decided, since he was riding a fixie and was obviously too cool for brakes, that he didn't actually need to stop at the stop sign. Well of course there was a car coming from the left that he very nearly ran right into. Fortunately, they were able to avoid a collision. The driver very understandably honked his horn at the cyclist that cut him off. The cyclist, meanwhile, gave the driver a one-finger salute.
Wait, what? Yes, the cyclist flicked off the driver that he, the cyclist, cut off! My mind was blown. "What was he thinking?" I thought. So I asked him. His reply:
"This is Portland, man."
Oh, and even though he continued to run every red light and breeze through stop signs without even slowing, we both managed to reach the Park Blocks at exactly the same time. But it's cool. It's all good, because he was riding a very trendy fixie. And he had a beard. And this is Portland. Man.