The first example that came to mind was the thing that happens to you when you don't grow up watching a lot of TV.
Doesn't matter WHY you didn't watch a lot of TV. Maybe it was a religious thing. Maybe your parents were hippie intellectuals. Maybe you couldn't afford it. There are a number of reasons why you might not watch TV.
The end result is that you miss pop culture references, fashion trends, current slang, all kinds of things that people use as in-group shibboleths.
This is also why I massively rolled my eyes a few years ago when social media decided that it's bad and rude and mean-spirited to poke fun at "sportsball." No one has ever been socially or economically penalized for being into sports.
Now, NOT being into sports? That's dangerous, subversive, and un-American. So I think sports fans can maybe cope with feeling a little bit othered over "sportsball."