Most of the English people I meet in England have told me they're impressed at how polite and friendly Americans are - but that's Americans in America, when they have gone there traveling.
They're also extremely impressed by the polite and attentive customer service they receive- from waitresses and waiters, etc.-as opposed to what they feel is less polite and attentive service they receive in their own country.
I can see it going both ways.
Once when I was working in a candyshop in England this group of American students came in and the girl wanted a diet coke. The shop only sold coke/zero or free or whatever it was. She obviously thought I was English because I hadn't spoken yet and she said, 'Where's your diet coke? I want a diet coke!'
I just looked at her and said, 'Well, as you can see, we don't have it, so I guess you need to go to another store, alright?'
She gets all quiet and says, 'Are you American?'
And I said, 'Yep,' and that's all I said, but it took all I had in me to keep from saying, 'So don't try any of your arrogant and demanding bullshit on me, missy...'