They are. I was playing Versus mode and killed a dying teammate so I could revive him with a defibrillator and he'd have 50 health. After I killed him he didn't realize I was healing him and he said "You suck!" and left the game. And we played with a bot instead.
This one time, me and my buddy Keith were playin' Left 4 Dead, and we were gettin' beat really bad ya see on a counta Keith can't aim for shit. So anyway, he was about to put the last tank of gas we needed in the car when this Jockey came outta no where and rode right into some Spitter goo! Man! He couldn't get the smell out for over a month! Not ta mention that his entire backside was covered in chemical burns...
Shit, I just played with the first guy to ACTUALLY make me mad and ragequit. Realistic Expert mode, two of us down from a horde, one of us dead, one of us alive. Tad, who is playing as Rochelle and has NO MIC ON REALISM MODE, is the guy still alive. I have 50 health and dropping, so we both tell him to revive me first. He seems to ignore us and goes up the stairs. Then he comes back down and goes backwards around a corner. I'm just about to die and he stops moving and types "where u at." I die. And I was right there, he looked at me about three times. Walked right by me. Then Tad goes and gets killed by a couple zombies, and Coach blows himself up with a grenade launcher. Game over. I ragequit. *crag* me.
And we played with a bot instead.
People kept walking in front of me