Bro, if they have to stop they'll be forced to use their muscles to get back up to speed again and in the process be revealed as a couple of fairweather / casual cyclist chucklefucks, and that will totally conflict with the image presented by their brakeless fixies, Chrome bags and Campagnolo caps.
Reckless bicyclists and skateboarders on sidewalks, off leash dogs, cars that roll through a crosswalk towards pedestrians, drunk drivers, hookers, johns, and weed fiends, victimless criminals, all. There is no law against being annoying; right little Ricky?
Stop bogarting their insecurities!
Regardless, buzzing you wasn't cool, and the "Hey Bro" should be punishable by death.
Of course there isn't a law like that Dread. If there were, you'd be eligible for the death penalty.
But there are laws addressing most of the items you mentioned, my little space cadet.