As an outsider sometimes you are not aware of cultural norms, but I always felt the margin for error for what Americans considered "acceptable" was too narrow. There was no benefit of doubt, and sometimes an explicit dislike for someone who did not immediately fit in.
As someone in their 30's struggling to deal with the passive aggressive, unflinchingly uncaring and overall dismissive behaviors of my city's people, I could definitely see this being a trend in my fellow Americans. All lip service and nothing more.