"I met plenty of people who never left their home state, and even those who didn't realise that European countries had their own currency - not the US dollar - lol."
So, then, you'd say that this would represent the average citizen of the United States? If not, what's your point? There are idiots everywhere, and they are not limited to the US. As for not travelling, I personlly don't know anyone who has not travelled out of their home state ... that is, people I know beyond mere acquaintances. Most of my friends, myself included, have been to other countries, but I would bet not nearly as many different countries as Europeans - but then, that's more a function of geographic location than anything else.
You may have a "clue" about America, but that's about it. Visiting here is quite a bit different than growing up here and living here. So, if someone who has and does live here thinks a statement you make about the US is clueless, then it probably is. Regardless of how much of an expert you think you are on our country and society.
SOB