Conversely, I have had many white friends whose speech was far more what I would consider "Ghetto" than what is generally spoken by a good 75% of my black friends.
Oh most definately. Then you got people from places like South Boston, and you can't understand practically ANYTHING they say no matter the race. But your reply is exactly what I was saying, although yes sometimes you can get a good idea from speech what race a person is, the majority of times you will be wrong.