It's very simple. People will try to get away with what their social group permits, or encourages. In my experience, that isn't correlated to money. Lower class cultures can be good or bad, upper class cultures can be good or bad. In the 'burbs, seems to be mostly young guys.This is anecdotal, and therefore unverifiable one way or the other.
Needless to say, however, I am skeptical that the average young woman will run across many suburban soccer dads prone to "holla at a bitch" in the same way that some other sub-cultural groups would.
What, you mean they wouldn't say what your stereotyped concept of a poor person, and thus inherently a black person, would say? Why don't you just say that instead of alluding to it?