97% of the time when an American asks someone where they are from they are genuinely interested and not trying to negatively stereotype the foreigner. We ask as a way to connect or get to know someone.
That the US is very large and does vary from region to region.
That most Americans will try to be helpful, but there are a few obnoxious people within our borders too. Most Europeans tell me the service in America is surprisingly good relatively speaking.
You can drink our water from the tap (except in Flint, MI, but that’s another story).
We have everything from beaches, desert, prairies, rolling countryside, mountains, tropical places, temperate rainforests, 4 season climates, you name it regarding climate and topography and we have it.
We have foods from almost every country, especially in our largest cities.
Most Americans work very hard and a lot of hours.
Americans aren’t all religious fanatics.
Our votes for president are typically very close. You can’t judge all Americans by who is president or what the current political policies are.