Bro literally everyone I know has watched at least the Great Pumpkin and Charlie Brown Christmas. People my age regularly make memes based on the football gag. It’s a cultural icon.
As a general rule actually, I’d say that Gen Z is more likely than may be expected to know about culture from before our time - the internet, after all, is a back catalogue of the best hits of humanity. That’s why spotify thinks we all have a listening age of 70.