Obviously it pisses you off to see a black man drive a nice Mercedes Benz!. You mentioned this before with a different profile screen name. Ali is a very "clean nice young man" I know him personally and I'm here to defend his honor.
E, you could be right with your conjecture, or the poster could just be making a comment about a very young man, straight to college from High School, driving a car most can't afford. Maybe the fact that he is black has nothing to do with the condition the poster sees, or the point he was making. I can't speak for him, but it is very possible it is the car and no job that has more of an impression on the poster, rather than the fact he is a black man with a nice car. Just saying. Again, I don't know, but I'd like to think it is condition of the value of the car, no job, etc. than the fact that the person is black. I'm hoping anyway.