Now this video obviously has some racial undertones as it seems, although we don't see the full exchange at the beginning, that the black guy is offended by something the older white guy said about shining shoes. But really, this is moreso a lesson about not letting your mouth write checks your ass can't cash. Regardless of the disagreement, the older guy got up and moved to another part of the bus and did his part to diffuse the situation. The young guy, however, just wasn't going to let it go. And to be fair, the older guy DID warn him that he "slaps the shit out of" guys like the young guy.
He meant that!
So learn a lesson folks, think twice about trying somebody just because you think they are weaker than you, especially when its apparent they aren't scared of you.
Oh and as a sidenote, how funny was it to hear ole girl filming the altercation first goading the young guy into fighting then after he gets his smashed talking about suing?