What role you think it plays?
It just creates communication gaps. There's cultural and historical nuances that are behind words and phrases that sometimes don't come across if you're not mentally embedded in the language. At the same time, your world view and someone else's world view might lead to different interpretations and/or expectations of the exact same conversation. It doesn't mean you shouldn't converse, it's just something to be aware of.
As for everything else, I'd say this. Despite what the news, including American news, might make you think, Americans in general are pretty open people. Because we're people, and at our core we're all good, even if we're massive fuck ups sometimes. Maybe for a while, as an experiment, instead of think "American" or "Russian" or "Chinese" or "Brazilian" or whatever, replace those words in your internal vocabulary with "human" and "good" whenever you can and see where that perspective takes you. You might surprise yourself.