Can we go?

So I queued up for a nice heroic run today after having several successful and fun runs (I know, can you believe it.) and I got in to Lost City.  I like this place, I like the pulls, I like the bosses and even the layout.  It's one of my favorite dungeons in Cataclysm.  However, there always ends up being 1 thing that makes a nice set of runs stumble a bit.  Today it was a frost DK that queued in a dps.  Now mind you, there is nothing wrong with them at all.  I like DKs, but this guy started off the run with a bang.  After he "accidentally auto ran" in to the first pull while the healer was still buffing up, the healer asked for a moment to turn off some addons due to bad lag.  No problem, I perfect the healer to be healing me when I need it, not 3 seconds after I needed it, lol.  So the healer goes offline to turn off stuff and about 5 seconds later we get, "This should not be taking this long." from the DK.  I though, wow really?  This from the person that pulled the first group with his/her face is now complaining?  After a couple more complaints about "how long this is taking"  which was only about 2 mins by this time, I kindly said "Feel free to bail if it's taking too long.".

OMG, you'd think that I just killed his family.  Starts talking in chat about how rude that was and whispering me about how rude I am and that that was totally uncalled for.  I responded that I was only being honest and if we were taking too long, then maybe he would be happier in a different group.  The hunter in my group then chimed in with "Well, impatience is rude as well.".  I love that guy, he's a good friend and guildie and doesn't usually say anything unless it is really deserved.  by this time, the healer has come back online, apologized again having to turn stuff off and was obviously a bit shocked what he came in to. I had to pst him to let him know that it was really not his fault, the DK was just out of line and no one else minded. Finally, we started back up and were on our way.

After 1 boss fight, the DK makes fun of the hunter and laughs at him because he lost a roll on a polearm to me.  My bud and I laughed about it abit in pst and just moved on.  But after the 2nd boss kill, the DK began to talk to us as if we had known him his entire life and were interested in everything he had to say.  He began talking about the nachos he was eating and other odd bits about his life and what was going on.  This totally through us off as a bunch of "????" started flying though whispers.  We get to the last boss and the DK dies almost right away from standing in the green swirls that usually mean "don't stand here or you die", you know, standard Blizzard meanings.  We down the boss and rez the DK while we loot.  No sooner is he up then he drops group.  not a "thanks",  "bye", "get bent", "you guys suck"....nothing.  At the very least, this gave me a great subject to put here in my blog.  I just don't understand people like this.  Starts off a total PITA and by the end acts like nothing ever happened and everything it happiness and light.  Talk about deserving of the "insane" title.