If you find yourself on the losing end of the situation, do not be bitter loser, this does nothing for you. Being angry means you have allowed the other person or party to control you. Instead, look ahead, see how you can make your situation positive then be a positive influence in your environment.
If you find yourself on the winning side, don't be the gloating victor. Where possible, make peace with the other party and be accommodating but also set limits so that the other party knows who's in charge.