As a foreigner from Italy, my first impressions on how Americans respond to me were in overall, positive.
Considering that for somehow Italians has usually good reputation, maybe because our old history or our creativity.
For taking an example, Uber drivers always asking my origin because my different accent, it comes out 1st because of my medium level of the language and 2nd because my Italian accent.
So the conversation starts always with: “Hey! Are you Italian?” and me: “Yes! And where are you from?”. Most of the drivers are from abroad but a good part of them is from Philadelphia, I always ask about the city because I am new and I always want to know more about. In addition, they usually give me advices to how to move better in the city, what are the cheapest restaurant, cinemas, clubs and which neighborhood is better to avoid.
But an Uber driver should be kind for take the highest rating; it is their own business.
By contrast there is a big difference with the approach between cashiers and Uber drivers, as I told before the second I mentioned needs a rating so they are nice, instead cashiers gets angry when there is queue and you do not understand what they said, this aggressive behavior I think is because they do not want to block the line because a tourist doesn’t understand something, I agree with this but they should be more comprehensive and helpful with foreigners because of their lack of practice with English language.
However, it is not all about business interests that an American behaves with a foreigner. For example my roommates are three and two of them are from USA, one from California and the other from Pennsylvania, the third one is from Venezuela but I think he is either American mother tongue. All of them are really nice persons they behave like brothers and they always try to help me with issues and they suggest me how to reach closest restaurant, groceries, shops and clubs.
In conclusion, my impressions are positive as I said before but I need to improve my English level for face the angriest cashiers and shop assistants.