Someday it may get me in trouble, but I just can't put up with this kind of crap. I believe those of us who care about how we are treated on the road need to be "roll" models. And I think part of that responsibility is educating (sometimes forcibly) those who ride their bikes in a dangerous manner.
Yesterday, I was paused at a red light when a cyclist (wearing headphones, no less) blew past me on my right and totally ran the light. I shouted at him, and when the light turned green, I chased him down and caught him at the next light, where he'd stopped (much bigger intersection). I pulled up along side of him and said "Hey, what do you think you were doing back there?". He refused to acknowledge my presence, staring straight ahead. So, I gave him a piece of my mind. Told him that not only were his actions dangerous to himself, but that that kind of behavior gives all cyclists a bad name and that he should respect the lights. Still staring straight ahead, he proceeds to ask me if I tell motorists the same thing.
Well, as a matter of fact, I do.

He, of course, sped off at a furious pace after the light turned green, and I turned right.
I also won't ride with people who ride like boneheads. For the most part, I ride with people who, like me, wear an eyeglass-mounted mirror so that we can be aware of our surroundings and know when it's safe to ride two abreast, and when it isn't. I believe that we must SHARE the road, which doesn't simply mean cars sharing with bikes. It means we cyclists have to learn to share too, even if it sometimes means yielding our right of way to a big truck on a narrow road. Not because the truck is dangerous, but because it's courteous to the truck driver, who 99 times out of a 100 is a hardworking person just doing his job like the rest of us.
I could go on.....
