Feels like the smushed down version of xkcd's lucky 10.000: https://xkcd.com/1053/
For the last 5 or so decades we've been transitioning from a world where everyone watches the same 4 TV channels to a world where everyone is in their own niche, and the tendency to be surprised that someone doesn't know about some cultural phenomenon is directly proportional to age. The way boomers gape and stutter when I said I don't know much about The Beatles...