Because you’re a jerk!
No, your jerkiness has nothing to do with it (hah!). And it’s not because of people like the author of this article, a self-described “asshole bicyclist.” It’s all about the science! So read this bit in Slate and understand as a bicyclist, or a driver, (we love you all!) that drivers’ assumptions and beliefs about bicyclists are grounded in emotions and not logic. It’s called the “affect heuristic.” Read the article to find out what that means, and wow your colleagues at work tomorrow with your big vocabulary and super smarts! (Hat Tip Instapundit)