If you think this is unrealistic, then you're living in a bubble. This is current affairs. And when people engage in large scale hatred, humor/mockery is a frequent part of it.
All large successful civilizations have words which equate to "barbarian". E.g. "gaijin". And you'll see mockery as well. E.g. ever notice the preponderance of clownish characters with freakishly cleft in chins in Japanese manga. E.g. that kid that Saitama meets in One Punch Man. Western world: cleft chin is pretty normal. Japan: Cleft chin is freaky and to be mocked. Or notice that when Japanese is Isekaied into some other world, then 2/3 of the time they end up introducing rice, miso and sushi? Insular much?
Looking down on, even loathing people from other regions is quite normal in the world.