You have a conflict. No need to worry; it happens to the best of us. But play the ball, not the man. True playing the man can work, but then only one person wins and the relationship is over. Take the Italian soccer player Materazzi. During the 2006 World Cup, a couple of pointed insults he made regarding Zidane’s sister made the French star player lose control. He head-butted the Italian and was thrown out of the game. If your objective is to eliminate your opponent, this might work. But if you want to reach an agreement, you’ll have to separate your opponent from the problem. Tackle the conflict, not the man. You and he are going to have to seek a solution together.