Honestly, I wouldn't be surprised if OP is telling the truth. Yesterday in a mythic HoV run I watched the group leader kick the highest DPS so that his guildmate would be top of the meters. I've been kicked myself (as a tank) for refusing to give people an item that I got, asking DPS to interrupt heals/fears/spells on trash mobs, "not tanking" untankable adds, and in some instances for literally no reason at all. I was kicked from mythic Arcway last week for "not giving" a rogue a pair of gloves - despite the fact that I tried to trade it to him but he was locked out of loot. On principle now I immediately leave any heroic or mythic where all four players are from the same realm/guild; I've had nothing but problems with a bunch of assholes who want to give a fifth wheel a hard time.