re: Group racks up $350 restaurant bill, proceeds to assault waitress/kitchen staff

I have another "black" stereotype I would like you to give your insight on

Blacks.....especially females, have a tendency to become rather loud, animated and boisterous when in a group. I typically do not see this type of "communication" when there are only two blacks conversing or when one black person is conversing with a white person. However, it seems to be the norm when there are 3 or more. Surely, you know what I am referring to. Like at the mall or a movie theatre and they are all shouting over each other and at the same time. It gets so loud and I just wonder why they are all screaming at each other and demonstrating such dis-respect to one another. It just seems so uncivilized and illogical. I rarely see this type of behavior from whites. Not even the white trash so I can't be certain it is just a socio economic issue at work. As a black man, can you give me some insight into why so many black people behave this way in groups? I have always been curious if it is just the way you are raised.