I'm not really surprised - now going to college with blacks I can tell you they continue to behave in such a manner even in higher education .
What exactly do you mean by behavior in such a manner?
It's basically poorly behaving. I'm sure you know what I mean. They just behave in ways that may seem inappropriate to white people when they are in presence of them.
I don't think it's right to say that all black people behave improperly. What you are saying is a gross generalization of black people. I recommend trying to read some books about the black experience and learn more about their lives.