That doesn't really make any sense. I haven't been super active on the forums for a while, but I don't think people gather together and discuss their postcount. There's a Neo group, but it's pretty quiet and is more just a place with a list of the Neos, but that's not elitism. Neo's don't sit around going "muahaha, we're awesome", it's more just like "grats on not being a douchebag." There's also the IRC channel, and that can be pretty inclusive, but that's not based on Postcount - anyone can go on the IRC channel, make friends there, and be included in the inclusiveness.
Can a high post count make a single person feel like they're better? Sure, but more often then not, those people are eventually banned. There's no real safety in seniority on the Escapist forums, they're pretty well moderated. And I've never seen a person turned away because they're new. That's just silly, how does one even do that? Bottom line, in other, smaller forums, you might get jerkwads flaunting their seniority over others, but not here. I think people who complain about it aren't really thinking it through all that much.