I've experienced this, in a browser game (bonk.io) if I happen to join a room full of Polacks they would often call me a pig in Polish because I have "UA" in my username then kick me out after a round or two. I don't understand Polish much but apparently just enough to read that (and also to read "LVIV JEST POLSKI"). One time, one of them had a(/the) swastika on their in-game skin, so now we know what demographic is doing the hate crime. Not at all impressed.