Not sure about today's episodes (have lost touch), but that was certainly true 20 years ago when we were watching the seasons 1-10 or so.
In my experience people criticizing others for being "pretentious" etc. usually can't fathom anyone liking anything that's either not entirely mainstream or having any second level of reading.
Heck, those people would accuse someone reading e.g. literature (something that billions all over the world have done for millennia) as "pretentious" (as if anything above Stephen King is some kind of crime).
"I was in Nashville, Tennesee last year. After the show I went to a Waffle House. I'm not proud of it, I was hungry. And I'm alone, I'm eating and I'm reading a book, right? Waitress walks over to me: 'Hey, whatcha readin' for?' Isn't that the weirdest fuckin' question you've ever heard? Not what am I reading, but what am I reading FOR? Well, godammit, ya stumped me! Why do I read? Well . . . hmmm . . . I dunno . . . I guess I read for a lot of reasons and the main one is so I don't end up being a fuckin' waffle waitress."
Bill Hicks would have been described as pretentious by people who disagree with what he says. They'd have also said his humour wasn't clever, it was just insulting, rude, and low-brow. They wouldn't be entirely wrong, but they'd be mostly wrong.
Same goes for South Park or Rick & Morty or The Simpsons. Those who disagree will find ways of protecting their world view against a trickle or tide of inconvenient or uncomfortable alternatives no matter how logically, reasonably, and / or cleverly the alternative is presented.
Your quote nails it. It is for people who want to pretend they are the smartest person in the room, largely because they watch South Park.