I visited England in 1986. I learned quickly that, if you use the American word for something, they'll tell you the "right" word for it immediately. They will also tell you everything else they don't like about the United States without any provoction at all. They hate Americans in Oxford, not dislike, hate. You'll be refused service in places, and insulted regularly. One female had some choice remarks to make while we were waiting for Sunday services at Christchurch Cathedral!
Ethnic jokes are perfectly OK in England. Bigotry is not something of which to be ashamed. Don't think English tv is all "Masterpiece Theater". There is some impressive schlock on British television. If you're served ice cream with whipped cream on top, eat the whipped cream and ignore the frozen library paste underneath. The gardens are beautiful. There are some wonderful old homes. The theater is marvellous, and I love pub lunches. But the English themselves are small minded and mean.
Mother was a young woman in the 1940s. She admired England and the English enormously. She would tell us stories about their amazing courage during the war.
Then she went to England.
The stories stopped.