Don't criticize, condemn or complain. Constantly criticizing, condemning and complaining is what breaks most relationships. Instead of criticizing and condemning, figure out how you can solve the problem together. Instead of focusing on blaming the other person for what they did wrong, focus on how you can avoid the problem next time.
Dale CarnegieIn talking with people, don't begin by discussing the things on which you differ. Begin by emphasizing - and keep on emphasizing - the things on which you agree. Keep emphasizing, if possible, that you are both striving for the same end and that your only difference is one of method and not of purpose.
Dale Carnegie