Imagine this situation. You're leaving a scenario in which you just got your ass handed to you on a silver platter. The rest of the group is frustrated. The leader of the group admits responsibility for the defeat. Another group member of your same archetype gives you some advice on how to improve your play based on what he saw. How do you respond?
A. STFU N00B! It's my 15 bux!
B. OMFG you're right! I'm such a dumbass!
C. Ok. I'll try it out.
Which one is the elite player's response? It should be fairly obvious that it's C. The elite player is immune to criticism.
Immunity to criticism means simply that the elite player simply takes criticism as it is without any emotional attachment to it. He still listens to the criticism, but he uses him own judgment and experimentation to determine the worth of the advice given to him. Because the elite player does not care what others think of him, he can also easily admit his mistakes in front of others and learn from them quickly. I had to do this during my last ToVL run trying to get Boss 8 back in position after the Casket of Souls fires. I kept pulling him too far, which of course, wipes the group because of the cleave.
The situation given in the first paragraph is part of the evaluation of new prospective Circle of Rage member. If the prospective member exhibits either response A or B, he is denied entry into the guild. A lot of times in combat, adjustments have to be made quickly to save a wipe or react to an opportunity to wipe the opponent, especially when outnumbered by a good ratio. Emotional drama during such a high pressure encounter will cause a group to lose quicker than just about anything else.
I don't know about you, but I don't like losing and by extension, don't like having people around me that can cause me to lose more easily. I'm not afraid of losing, but I'd rather not lose given the opportunity to win.
Become emotionally detached to criticism. If the criticism helps you, implement it. If it doesn't work or is just given to try to aggravate you, ignore it. Improper emotions cloud accurate judgment.