So what, he "beat his girl down"? (slight sarcasm) It's nothing that isn't celebrated in most of the rap music that's come out of Hollywood the last 15 years. In fact, what Brown did was somewhat tame compared to what some other rappers have suggested be done to women.
When the entertainment elites make a fortune off of music that's telling our urban youth to act this very way, excuse me if I'm not outraged when they actually do.
A black woman I know said, “you don’t know what Rihanna did to provoke Chris Brown’s reaction”. That tells me that “beat downs of women” must be culturally acceptable to some people.