People regress sometimes. I had a friend at university whose begun, over the past year, spending time primarily with this high-school nostalgia group. It's a shame. I guess I conceptualise uni-friendships as being of a different sort than the ones that characterise middle school. But this group of friends totally recreate the pecking order and self-centred-saccharine that comes off when you see a group of 13 year old girls get on the bus. There's the requisite head of this group - it's is the kind of histrionic gay guy whose preferred literary form is the tweet. Short, sharp, simple. And there's the strange one, flung out to the outer reaches, struggling to get back in, tagging along behind, squeezing into some kind of comprehensible box.
While any group can fall into the same kind of marketplace of status, I think that there's certain ways of interacting that legitimise and encourage it (privileging bitchiness, self-centredness, apathy, normativity, etc.).