I rarly raid cuz of this reason.
But there are 2 raids i rember very well where we wiped a lot and insted of qq, ppl was actually telling jokes about it.
Once was in Naxx and after wiping on the 4 horse men we heard ppl say something like:
I blame the tanks! -He was the Main tank.
I blame the horse men!
I blame the Financial crizes!
On another raid i can't remember where. Back in the guild somebody askd how it went and the new guy says:
My dad once said that if you try and fail you make progress, if you try and succed, you failed. Based on that we made a shit load of progress!
WoW is a game. Not a Life or Death situation. If raid leader start bitching i'm out.