Some of this comes from hostility, some from stupidity, some from jealousy and some from reality
What about total ignorance.
Once I was flipping through channels on american TV and I spotted this Paris Hilton show (Simple Life or something) so I decided to check what the fuss was about. She was working on the farm. The farm was disgusting; mud up to the knees and filth everywhere. The owner a typical redneck. In one point he was telling her to take a "polish truck" while indicating a wheelbarrow and move something from one place to another. Paris did not say anyhing.
I was speechless for a while. This moron never meet a Pole in his life, never went outside his state not to mention country, has farm so filthy as I never see in Poland and just making himself feel better at someone’s else expense. Lovely.
Later this channel apologized to polish community in ...polish newspaper. They said they will not re-run this episode. Big deal. They just know Poles will not protest like the others would certainly do.