Are you serious? I got the joke instantly. The gag is that 30-40 years ago, conservative Boomers were paranoid about satanic messages in media, and were on a witch hunt to cancel things they deemed problematic. Now in current year, Millennials are adults and thus the new wave of paranoid, delusional Chicken Littles who constantly attack everything as being racist – all in all, having absolute zero sense of irony and self awareness that they're effectively the new Boomers.
I'm a Xennial (older Millennial, late 30s and powerleveling) and I distinctly remember the Satanic Panic and how Boomers were on a crusade to censor media. In a strange turn of events, the progressive Millennials have filled their parents' role of being delusional and wanting to censor everything.