the English do slag off Americans but I'm sure Americans do too. but hey Brits slag ofF the French a lot havnt you noticed? And Germans are forget branded on par with nazis in many so called comedies.
Personally I don't like it I don't believe that all Americans have great teeth either considering there is a great deal of poverty over there that the government seems to turn a blind eye to. I think the Brits would rather spend their money on things they need, and cosmetic surgery on teeth is not a need. I was asking my dentist about teeth Whitening she told me it's not worth it in the long run. It can make teeth sensitive and lasts between 1-3 years depending on your eating habits. better to have good cleaning habits and good ole bicarbonate soda.
I went on an exchange with 16+ when I was 17 to New England, and Boston. To be honest I found them as I saw them on tv, overly friendly and confident. I did also think they spoke a lot and overnalysed things but that can be a positive tool especially in school. On observing their school life to the british way I'd say they encouraged kids as young as preschool to do public speeches which gave them superb communication skills and confidence which british kids on the whole seem to lack. I know out of the 30 kids in my class only 2-3 were very confident the rest including moi, would shy away from questions , forget presentations.
Another thing I liked was their hospitality to their guests and their customer service. Wow the british sales assistants could learn a lot here. high end store or regular department store assistants made you feel like you mattered. It was always madam never a grunt as is the norm in the uk sadly.
To be honest I don't care if they sound fake when they say how are you madam, having a nice day etc, it's better than just looking like someone has died, and completely ignoring a customer. I've yet to meet a rude american, I'm sure they exist.