It's just tank-rage settling in. Don't let it bother you. As a healer, I normally just shake my head in awe and amazement when people do things to kill themselves or when a party falls apart. I care, but I don't throw myself into the line of fire.
As a tank, I end up cursing like a sailor. It just makes you watch your party and consider who they are and what they're doing that much more. It'll help you a lot when/if you get into a static or Savage content.