OP: "Dude" in the context of your poster means a fancy fellow either from back east or from the city-- one level below a "slicker" (someone with slicked and dressed hair)-- who comes out west to become a dilletente cowboy for as long as he can stand it before running back to the predictable comforts of civilization.
Dudes or slickers who try to tough it out in the west are called greenhorns (a young buck-deer just budding his horns).
In the vid discussed, this cop comes on the scene already with a major case of the ass. Whatever the motivator, he was itching for a fight and was pulling a big-time Barney Feif on these skaters, looking for any excuse to go off.
And beating up on scrawny 14-year-olds is just bully's work. Skaters are hardly a menace in Baltimore, or anywhere else. He should've gone down and busted up some druger-dealers or gangsters if he was so pissed and bad-assed.
