Why? Because friendships happen through shared experiences. And so, unless you only watch mainstream shows and listen to mainstream music, the breadth of your experiences is beyond anything anyone can ever understand. The anime you watched when you were 15? The band you loved as a college student that no one cares about? The book you read which isn’t even translated to your mother tongue? It’s all lost. Lost experiences, unshared with anyone. And you are alone in consuming it all. As alone as CJ when having sex with his brother-in-law’s cousin. Except your girlfriend won’t get that reference, will she? Or maybe you won’t either.