While I was in SF this wealth disparity feeling was present, but it was an order of magnitude less than what I saw in Mumbai. There you have 30+ story building acting as the personal residence for a multi bilionare (complete with 2 helipads) and across the street a family of 3 living on a "tent", cooking food on a makeshift fire made from trash and a baby drinking milk out of a transparent plastic bag - all of this under the nauseating smell of human feces. This wasnt a one off thing, its all over the place.