Around here, they're referred to as "Massholes", and are more than just losers. They've been known to engage in prolonged obstruction of traffic and vandalism of automobiles, have staged collisions with motor vehicles, and in at least one case, forcibly surrounded the vehicle, pulled the driver out, and beat him severely. There have also been minor confrontations with police. They claim to be trying to "bring awareness" of the problems of cycling in the city, and the lack of respect shown them by auto drivers (not that auto drivers show each other much respect IME); but the only awareness they're bringing is of what a bunch of extremist asswipes they tend to be.
As far as this putz goes, I'm fully willing to believe that he telegraphed his intent to ram the officer, as the officer claimed, only to veer away at the last moment to make it appear as if the police officer was attacking him instead of defending himself. Massholes are fond of those sorts of martyrdom tactics.