You miss the post entirely.  Locals are so used to putting down newcomers that they carry the habit on to put down each other.  In the real world nobody cares about what high school you went to or the neighborhood (island) where you grew up.  Real people want to know what you've accomplished since you put away the pom noms and the letter sweater.  Where did you go to college?  Where do you work?  What do you do for a living?.  There's more to life than just being from somewhere its all about where you've gone not where you've been.