Jew is generally an offensive word in Poland. They’re considered really wealthy, but they’re also selfish. A sterotypical jew has ≈1′000′000 PLN in their bank account.
I’ve never called someone a Retard or a Gyp before because I replace English offensive words with Polish offensive words (even when talking to someone who doesn’t speak Polish). I frequently use Bękart, Dziecko z kazirodczego związku, Daun, Huj (sometimes spelled as Chuj) or Kamzik (it’s actually the surname of my old teacher who was a pedo)