Now you know how drivers feel when we filter up past them at lights and they have to pass us again. Indeed, why do you feel like you have to pass him again if it is "dangerous" to do so? Why not just hang back and take him when a safe and easy opportunity presents itself...even perhaps pulling the same stunt that he did to you?
IMO, you're making a mountain out of a mole hill....it's traffic, whether the guy is on a bike or not, just deal with it and don't let it get your blood pressure too high. Enjoy the ride and don't let the small stuff bother you too much.
Edit: and what does his bike or what he was wearing or not wearing have to do with anything...or is that part of what ticked you off?