(I will assume as if it was written about Eastern Europe and post-Soviet and not just "Slavic" nations) During my three years in the UK I had 4 instances of a bit weird interactions where people made out of pocket comments regarding the place I am from but I didn't think anything of them. Also most people are very nice and inclusive. But it makes me wonder what people imagine when they think of Eastern Europe.

In media some representations are kind of cringe, like every Eastern European woman is a mail order bride. The jokes about Trump's wife on the American media were not the most considered, same I can say about Borat films. And I don't really mind stereotypes but there are very few positive stereotypes about Eastern Europe. But generally I think people seperate the person from the stereotypes of their ethnicity or nationality and most people just don't know and don't care about Eastern Europe, so there is nothing to be prejudice against.