This could easily be misread as a culture war tangent, but at the risk of "explaining the joke", it's a reference to the song "A Boy Named Sue" (which TIL the Johnny Cash version is a cover, with the original artist being Shel Silverstein).

I modernized it. I would hope rebel country would proudly wave the flag of the echos of damnatio memoriae'd trade unionism and socialism that flourished in Oklahoma before the evil of May Day 1919 and the likes of McCarthy and Roy Cohn that scared Americans into making self-respect and fairness cultural taboos.