My 72-yr-old neighbor downstairs visited the USA for the first time last month, upon her return we talked at length about how difficult the people are here in Argentina, as now she has somewhat of a reference of what I've had to adjust to. She was absolutely floored when walking down the street in NYC and a young passer-by smiled at her for no reason. Every where she went she had stories about how nice people were, about how in a city as big as NYC people can still walk down the sidewalk without pushing and shoving each other, how some one in a store says "hello, can I help you?" when you walk in, all these things that never pass in BA. I went back to the USA also for a month recently, the first time in 2 years and I was also amazed at how friendly everyone is, and I think it was amplified after living here and having been away from it. Something I never appreciated while I was there, until I lived some place where the people are so coarse like BA.