I think Brits lost their taste buds in The Blitz. It is the worst food I have ever had. Everything fried. In old oil. Ever smell fish n' chips out of a newspaper? Foo. Vegetables are either the mushy peas or the soggy brussels sprouts. I shivered my way through an Oxford winter with only an "electric fire" to warm me. No thermostat on it either.
As for American food, what about California Cuisine? Southwestern? Cajun? Barbeque? Soul food? Every one of them an American original. Ever hear of Mom and Apple Pie? We invented apple pie. And I'm not too certain we didn't invent Mom too. What did the British invent? Squashed badger, in a pie.
Dentistry is bad because of socialized medicine. That and everyone smoking like crazy. Ugliest women on earth too.
A lot of traditional British foods are pretty stodgy, I'll give you that much. However, we eat curry and chilli and all that stuff like there is no tomorrow.
I think that
Art Eatman made a good point about the football hooligans too, those guys could make the Imperial Stormtroopers look good.