I don't know this Benny person, but I have known people like him. Now I will start on a few paragraphs of attempting to sound intelligent.
Its possible that he's insecure and afraid that if he was really nice and polite to people, they wouldn't like him anyway, so he's a dickhead and gives people a reason to not like him. But then he realises, consciously or unconsciously, that its still his own fault that people don't like him, so he uses the race excuse to make it everyone's fault except his. A lot of people like to be righteously angry, or at least think they are.
Or its possible that he is so desperately starved for attention that he likes to encourage people to kick his ass because an ass-kicking is at least some form of attention. Adding the race thing to that creates controversy, and being the center of a controversy is definitely attention.
And I really don't know what to do about it, if he was still in elementary school or something there might be hope, but he's already in high school, cookies and extra hugs to raise his self-esteem might not be as effective. If you're feeling really strong, try to have an at least 5 minute conversation with the poor bastard about something neutral, ignoring any stupid comments on his part. But if you're not, which I probably wouldn't be, either, just stay the hell away from him.
Yes, I have known many many people like him before. One of the most memorable was a short, grimy kid in my 8th grade history class with a habit of standing on his desk and screaming wrestling slogans for no apparent reason. The one I had to put up with the most was a guy named Scott (no relation to our bad movie Scott, at least I hope not) who sat next to me in art class last year. He didn't threaten people or insult them, he just did every annoying thing he could think of to get somebody to acknowledge his presence. Every anecdote somebody had had to be followed by a similar, better one of his, usually obviously a lie. One of his favorite things to do was to pick the most expensive medium he could find, scribble a half-assed attempt at a drawing, then say "I suck at art" and throw it away. Poor deluded Scott. . .