The sandwich shop example is a little weak, but I agree with Brook's point. There is a cultural segmenting of American society into the top 20% and the rest, and it's a strong barrier to social mobility. At the college I attended, there was a clear social barrier between the kids from upper middle class urban families, and those from lower middle class suburbia. The differences in interests and life experiences were profound and hard to overcome. Ironically, the much derided fraternity system was one of the few effective measures for bridging that gap, by creating common experiences and a new shared identity.