The Little England zenophobia in this comment is mind blowing.
I lived in America for years.
We lived in many parts of America during those years.
But there are three hundred million people there.
It take more than a week to drive from one side to the other.
It is vast.
There are cultural norms in different parts of the country (see? Just like us!).
There are many, many things to lament over there.
But one thing I have found consistant all over, rich or poor, is high value on good manners! That may manifest in different ways to the our English way but SHOCKER - they are not English, and have their own way about them.
The idea that everybody, all 300 milion of them are rude to staff is utterly assinine.