I have always heard these "Polack" jokes, like they are supposed to be stupid.

Well they sound pretty smart to me. Not kow towing to the radical LGBT nucakes, like the rest of the Western world does.
Also, Poland is in deep doo doo with the Libs/Socialists/Communists of the EU, like genius Merkel of Germany, and the Swedes, because Poland allows zero Muslim immigrants. Poland got f*cked over royally during WW2 and they got sick of being pushed around.