It's not your fault.
From your OP it's obvious you are not a rager, despite a couple bad experiences you are able to articulate yourself well and ask for feedback.
The way I see it you have a couple options.
You can keep looking for micro-communities that are closer to your ethos (guild or friend circles).
You might get lucky or it might take you a long time and still strike out.
I am sure that some pockets of normal people (no matter what "welcome to the internet" people will tell you, being a douche online is not normal behavior) will have remained.
The thing is.. this virtual world has its own set of rules (simulated but you still die a virtual death from fall damage)
It has incentives and deterrents.
Modern WoW has evolved (or devolved in my personal opinion) from a seamless world with a heavy tax on single player playstyle, to a collection of mini-games with a heavy tax on group playstyle.
Even the activities that require a group to complete have been padded and packaged and twisted to create the illusion of self-reliance and a single player experience where other players might as well be NPCs.
That kind of game design permeates and formulates its audience.
So yeah there were always anti-social players, but there were fewer of them proportionately and they also paid a tax for being that way.
Nowadays they are given free reign and provided with the tools to prosper; so they proliferate.
TL;DR: You're being phased out. You can either join them, grow a thick skin (i.e. join them) or bow out.
I wish you luck finding a group of like-minded people though.