No mate, culture.
And I say that very much tongue in cheek.
I do believe it’s time everyone took themselves a little less seriously, and tried not to be so reactionary.
The fact of the matter is that the majority of people on both sides of the Atlantic are well-reasoned intelligent and by and large well-informed, and if you wish to base your opinions of a nation on an insult on a football messageboard, or worse still, the English media (which we all, frankly, find rather cringeworthy bar the 4 million people who buy The Sun), then that is up to you, but no that you are living in a world of paranoia created for you by unseen people.
Face to face, person to person, there is more than enough respect, humility and good-nature to go around.

On the football side, European fans are well aware of the US’s potential. The MLS may not quite be there yet, but the US national side is showing remarkable improvements, and I for one was cheering for them in their exceptional victory vs Spain not so long ago.
The fact you’re on the receiving end of “banter”, as we say, should give you all the clues you need as to your perceived potential in the game – if you had none, we just wouldn’t bother.

I think you’re wrong about the respect that your teams are getting. Much of the talk around World Cup time seems to be of the progress that’s been made by the USA national side in the last couple of tournaments. Truth is we all know you’re improving and are not very far off being a force in World Association Football.