The cost of not knowing how to deal with a difficult person can be huge. Win the battle over who is right with co-workers and you could lose the war when you need their cooperation and support the most. If you insist on being "right" with your boss, you could pay even more dearly. Being right may feel good in the moment. But the next moment, you may be watching advancement opportunities and even your position disappear. Sometimes it's better to suppress your feelings and simply put an agrument on hold, or agree to disagree - and then move on.