The jokes have their roots in the turn of the century, when semi-literate country bumpkins from Poland poured into the country. They have lost their sting, IMHO. Let's also not forget that the median IQ in Poland is 114, higher than the US. The reason Poland isn't as wealthy as it should be is due to various cultural and historical factor that several books could be written on.
Now, let me go look for my Bapscia's recipe for ice cubes...
Care to share it with the rest of us?