IMO, i think white people (i'm speaking generally, not all whites) are afraid of blacks. I think most white people really havent been around blacks too often and all they see is stereotypes on tv and movies. So when they see a gang of black boys they think,"could they be in a gang", not, "oh they just got from sports practice". I dont thing its also them beign racists, but just ignorant to the unknown.

I think some minorites tend to stick with their "own kind", because of this ignorance. Having to explain the "black nod" does not occur among blacks. having to explain this is like having to explain who you are. Some folks would rather avoid this.