Tanking has made me nice to other tanks (that deserve it) and mean to those who don't know how to do their job. Example: Yesterday I got stuck with some of the worst random pugs I've had since 3.3 came out. Pug #1: HoS, someone says, "#&!@!" and leaves. I don't like HoS either, but it's quicker just to run it. We have two paladins, one of them selects tank/damage when we queue up again, the other one, several seconds later, selects only tank. The instance proceeds with them trying to outthreat each other on everything, including pulling extra guys so they can have a chance at more mobs. Tank #1 (way less geared than #2) dies, and startings cussing out everyone, I can see this is going no where fast and I leave group. I would be nice to the tank if he #1: wasn't being a douch and #2: playing like he was part of a group and not trying to outthreat the other tank on everything.
Pug #2: HoL, undergeared tank, but at least as geared as when I first starting tanking HoL. We survived the overcharged boss without too much trouble, so obviously we had the gear for the instance. We get to the slag room, tank does fine, gets all the adds. Retarded lock and ret pally (700 dps ret, btw) stand right on top of the tank and aoe. My ele sham is just cruising along at the top of the stairs, waiting to rez whoever dies. Druid tree, once the other two dps dies, proceeds to say, "Oh great, another tank who doesn't know how to pull this instance." That ticked me off becuase it wasn't the tanks fault at all. I proceed to badmouth the healer for being a douche. Healer leaves, we get another instantly. The new tree says, "Oh great" once he sees we're in the middle of the dungeon. I tell him the tank, while a little undergeared compared to the t10 tanks, is doing fine. We get past the slag room again, pally dies again and releases instantly, lol. We took out the group right there and went up the stairs. Warlock pulls aggro on one of the dude at the top of the stairs. The mob comes and pounds on him. Healer is so geared that one or two of his hots keeps the lock up. Nevertheless, lock proceeds to fear the mob, who runs rampant across this instance pulling another group or two. I was like, "dude, never use fear in an instance." He was like, "What else was I supposed to do when I pull aggro?" I was pretty upset by this time, so I say, "Get omen, pay attention, and quit being a retard." I try not to be too mean, because these people do have feelings and I used to be a noob too.
Non-PUG #1: I was so fed up, I begged guildies to group with me, lol. Guild MT says he's fixing to do his random, couple good dps come too. We get vh, burn heroism at the end and kill the dragon in like 19 seconds. Pug healer finished the dragon fight with 1000 dps, lol. Happy ending.

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