When noobness is met with a condescending tone, the result is never good, and egocentric. It's worse when the chat happens in party as each player will most likely try to 'prove' something. It really makes it awkward for the other players in the group as well.

I think we all can admit that the game is far more enjoyable when the player base gets along with each other. Sometimes I think it just takes taking a step back and remembering that we all have similar goals, especially in an instance. It's a lot harder to accomplish them if engaged with each other instead of ugly mobs.