What you say is partly true. Hollywood TV Jews in the 60's and 70's (and years afterwards) like Norman Lear and George Schlatter created shows like "All in the Family" and "Laugh-In" which got anti-Polish jokes going in the US because in those days the 3 main Left-wing TV networks had a virtual monopoly on the TV propaganda that was put into the minds of the American public."Polish" Jews started and popularized the now famous Polish Jokes. The sheeple merely parroted after the Jew media.
Poland used to have the biggest population of Jews in Europe, at least five million of open Jews and crypto Jews hiding in Polish Catholic Church. Poland was the most unfortunate of all nations to be infested so much by Jew filth - this fact alone should give you a clue who started the Polish Jokes.
Some "Polish" Jews started to emigrate from Poland at the end of 19th century, and many of them moved to USA. This is when Jews started the anti-Polish sentiment. After WW2, this migration of "Polish" Jews escalated and that is when Jews popularized their Polish jokes.
Many of the "Polish" Jews who came to USA ended up in press media, radio, Hollywood, TV networks, Wall Street, etc. They are the ones who started the Polish Jokes, and still insert their anti-Polish innuendos. Just scan many of the newspaper columns written by Jews after WW2, full of anti-Polish sentiment.
Jews also started the jokes about dumb blondes and about Whites in general. Jews are not Whites as many people believe. Jews are mongrels and actually hate Whites. Jewish comedians made careers out of dumb blondes jokes and Polish Jokes after WW2. Only Jews with their total domination of Western media could popularize dumb blondes jokes, Polish jokes, or so called redneck jokes. Jews had the means, opportunity, and motive. Case closed!
Most of these TV anti-Polish Jews were Left-wing Jews, but there are some more traditional minded Jews that spoke out against these anti-Polish joke/slurs.