I think you're mistaking the elitism we all know and abhor for simply being good. There are a growing number of players who refuse to play with anyone who isn't on their level. These are the ones who have party flags which ridiculously high ilvl requirements (despite the content requiring much lower) and list comments like "screw up, get kicked", This is immediately apparent to anyone who opens up the Party Search box trying to find a group. These types of groups are becoming the norm, rather than the exception.

The issue isn't that only the elite post their parties, it's that those mid-tier and low-tier players who do post their groups have often had high-tier players join only to criticize and judge. They're not interested in helping a player to get better, only to rub their face in the dirt that they are 'superior' in some way. That is the real reason elitism get's such a bad rep.

If you're just good at what you do, that's fine. It's when you grind people beneath your heel in your wake that people get annoyed and call you out. I'm not expecting every good player to go out of their way to help newcomers, but this anti-social extreme is not acceptable and someone was going to mention it sooner or later.