That's a pretty uninformed opinion. YC is a collection of smart people trying to build things...

That "fancy apartment" is the cheapest place you can find in Mountain View with 4 people stuffed in, half sleeping on the floor.

How many YC founders go on to business school? I've heard of none, but I'm sure there are a few... But do you have anything backing up that people go to YC for that reason?

I think I went to one party during the course of YC. In fact, all I really did was build product and talk to users. It's one of the mantras of YC and anyone not following that advice certainly isn't seen as a "cool kid".

Probably not worth trying to change your opinion, but you're 100% wrong on every point (except the first if you define "cool kids" as people working hard trying to build things).