I learn most people, regardless their country and origin are nice, respectful, not rude - however there's situation and condition that probably turn few and some of them to be an evil. And there's particular condition that make worsening. This particular situation could be many thing including ourself.
Before we moved to KZ, we had an impression that KZ people were cold, rude, arrogant, supicious to foreigner.
We had the same impression from few of our colleague there; but having lived and interact directly, once you respect them, I can say they are one of nicest and warmest people on earth.
We had two farewell parties, with my office colleagues, nice, freeflow wine and beer but nothing special, and then with KZ friends, full of hugs and tears.
My wife was a volunteer in Outpost, an organization, that help all new comer to live in the host countries. Despite top class facility provided by company, not all people or family easily adapt their new home.
Major issues, particularly for first time expat, in addition to culture shock, feeling superior or expert for everything, bring their "standard", value and measures; assume everything different is inferior.