Find out who YOU are on this list after you've tried a few raids on level 80, it will make more sense then, its always fun to read anyway though, give it a look.
http://www.wowwiki.com/People_in_your_RaidI'm the
The ElitistThis guy used to be part of the core raiding team of the best guild
on the server, but has since been forced to downgrade to you guys
because of schedule problems or drama in that guild. Alternatively,
he's been with you guys all along and wants to shift to a harder core
guild but can't because of said scheduling problems. He's better than
all of you, and he knows it, and he's not afraid to say so. Never seen
anywhere but the top of DPS/healing meters. Generally makes snide
comments at every wipe and argues with other people over strategy.
Hates farm raids with a passion and all he wants is to do progress.
Nobody admits to like him in public but lots of people suck up to this
guy.