Like a good vice-guild leader, I was chain-running some noobs through dungeons to get their levels up. I had 2 arcane mages, 1 destruction warlock, and a mostly competent druid healer, who honestly didn't have much to do as far as keeping my tanky butt alive as I could pretty much solo the same heroics and non-heroics we were running on my lvl 80 warrior even in a dps spec.
By chain running, I mean I started with a lower character (around low 60s) and gradually stepped up to my lvl 80 with EXP turned off while I leveled them from mid 50s to low 80s. It was clear my DPS guildies were... "special". They kept pulling when they didn't need to. Dying to simple, avoidable mechanics. Ignoring instructions to "MOVE OR YOU DIE!"
I watched them ignore the fact enemies had spell reflect up on multiple occasions and take themselves out. While going through Pit of Sauron, the final boss has an ability where he marks a player, and all damage done (physical or magical) to the boss, is redirected to the target. Idk if it glitched, but I got marked and I watched as they all started casting Arcane Blast x2/Chaos Bolt. Me, not wanting to kill myself, IMMEDIATELY stopped hitting the boss and put up my own reflect and popped some def cd's, not expecting much. What ensued was hillarious. They proceeded to hit the boss (with guaranteed crits!) which reflected to me, which bounced off me and... instead of going back at the boss, proceeded to instant-overkill the three idiots.
They had been constantly blaming my tanking skills and the healer throughout the hours of dungeons when they were just plain stupid AF. When complaining in a global channel about it, they learned the hard way you don't mock your MTs/MHs. I'm not sure, but I think they may have quit because I never saw them online shortly after that.