The joke is Jordan Peterson & other John Birch Society types. It's their newfangled version of the "Jewish Bolshevism" theory. Of course, their main boogeyman now is the Chinese (Sinophobia is, in the Nazi sense, the new antisemitism, since Jewish institutions have been captured by the CIA, many religions have I'm not saying it is a special quality, but they are the only one with a Rhodesia, and Rhodesia is gone, so, actually I am saying special, but not unique). Ironically, Cultural Marxism—if studied historically, rather than ideologically—reveals itself as a CIA pro-western institution meant to ensure the humanities were not ceded to communists (the concern many NGOs now have with Trump rampaging thru their fundraising strategies & PR). The shirt just means "I am left of the John Birch society." & statistically, the wearer watches Hasan Piker.

If you want to check if this is just more of my rambling, here is a nice man (who never talks like me because it's his job to explain it to students & has explicitly called out the kind of behavior I reflexively do online as BAD) who is popularizing & refining this study: https://www.youtube.com/watch?v=_FztGkdoO0I / https://inv.nadeko.net/watch?v=_FztGkdoO0I

This is two hours but there are several days of podcasts on this which are just professors doing Zoom calls with a brand slapped on. I love them & you will too. [pointng gun at you in a friendly fashion]