When I lived in New York City, I used to get tickled when people assumed I was honest just because I had a slight southern accent. At the same time, the people who thought I was less than intelligent because of that same accent really irritated me.
In the United States, we tend to think of prejudice as always having a negative impression based on someone’s race. Actually, prejudice is pre-judging anyone based on any aspect of them you can see or hear without knowing anything else about them. Often those judgments are negative, but sometimes people can be predisposed to like someone just because the person reminds them of themselves or someone else they like.