On of the worst LFR group I've seen was not the ones, who played bad or were in greens (I can usually carry them). They were... don't want to go into insults, but their behavior was very questionable. So here is the story.
I went into 2nd half of HoF with my prot pal(main) and friends alt dc priest. Tanked everything on Meljarak with no control (there is no need really when you have mass dispel).On Amber Shaper I ended up being the top dps (by other people's recount, I know reshape damage bugging). And in the end of the fight I noticed two people in reshapes just derping around, running from raid that wanted to take them out, don't interrupt their casts and in general just running and jumping. As I said, I don't really mind weak players in LFR, but this was obvious trolls. So I shout some raidwarnings to kick them. And shit became serious.
The crowd stacked up against me, that I am nerd from heroics want to punish casual players, that I should stfu and carry them. So I immidiately replied "you want to carry these trolls? carry me as well, whats the difference - 2 or 3 people". Another tank seing things going bad decided to escape with his life (wise decision). The crowd tried to force me into carrying them again - pulled trash before emperess and ended up dealing with it by themselves. Hell no, guys, now you should carry me, cuz' I'm in troll mode now. After the trash, shitstorm to me was rising and they decided to kick me. This is absolutely obvious - "kik the trolls? nah.. lets kick the carry!".
So 1 vote left before they can kick me and I'm not going to allow this. So I pulled the boss. Meanwhile some dk specced into blood seing there is going to be no tanks. Its your moment to shine, bro! Carry us! LRF emperess is solo tankable with almost no problems. Just kite the boss while tank is mind controlled. So dk tanking, I'm staying and watching. He gets converted, boss turns to me... nope, BoP! And raid in panic run around. I'm enjoying my justice being served. On the adds phase dk did a decent job, tanked them all. Lokks like everything is going to be okay. But dps is very low, so here is the second add phase. And something went wrong. Dk is still alive but not picking up the adds. Dunno, maybe he gave up. So the raid is dying one by one. Cries and insults everywhere. Yeah, the justice is being served, hehe.
Fortunately my friend disc knows his fade button, so he is alive along with 3 or 4 other people. And you know, when you troll this hard its extremely important not to shit your own pants. So i picked up the adds. Strong cd's and disc friend are keeping me alive. With so much vengeance I've jumped from 0 damage done to top damage done. Time is ticking and emperess advances. One stack, two... I need to survive some more. Three, four... here it is! I'm getting controlled, the last survivors die and boss evades.
So I'm standing alone on a field of corpses. "/r so, guys, you kinda failed to carry me. where is my lootz?" And as the final act of mercy, resisting a strong urge to /dance on their bodies, I mass ressed them. A split second before being kicked out.
Sorry for long post. I hope you enjoyed the story.