You're not wrong by getting so angry, it is a perfectly normal human emotion imo, but keep it inside. But, if it really bothers you, you shouldn't ignore it, sometimes you regret that you said or ignored something.
Have been cropping up anger in a RL situation. As a solution, I did something about it that wasn't very nice, but justified and good for me. There's not much anger left in me now.
However in WoW, dungeons are only for 15 mins and the chance u'll see the same person again is nearly impossible.