I've known several people who have the attude expressed by the letter writer here. And I never know what to tell them.
I want to say "Grow up! Quit sucking! People who base their egos on bitching about everyone else are yucky and nobody wants to be friends with them! Also, I've been listening to Radiohead since at least 1996 and I can assure you that plenty of other fairly mainstream people have, too."
But I don't.
I just kind of smile and nod and pray they are being ironic when they refer to people not like them as "normals," "mundanes" or what have you.