I'm coming home the other day from hiking with my dog, and decide to swing by zaxbys and grab a salad. To get there I have to drive through the parking lot to get there. An African American couple is walking across the crosswalk at a fairly brisk pace and are looking ahead, about halfway across they look dead at me and then for the other half walk as slow as humanly possible for the rest of the way.
I'd say this "I'm not going to hurry for a white man" attitude happens to me several times a week, upon speaking to friends about it they say it happens to them as we'll. I have never been rude or given or impatient with them.
Its not just a perception thing because they actively slow their pace when they know you are waiting on them, like they derive some type of pleasure from this.
Now I live in a predominately African American middle class neighborhood. None of them ever act like this and have been nothing but friendly neighbors. It is predominately the poor African Americans (at least from my experience) that behave in this manner.