American are at least as class-conscious as our British cousins. A look at advertising shows it.
I've known people from every class, from the top "old money" families that shaped this country's history, to the homeless, and I've seen all kinds on every level. Some people are kind and generous with their money and their time. Others are completely self-centered and cold. Regardless of their economic or social class. I conclude from this that "class" is not a reliable indicator of class. ;-)