Many times we want to be in control and have the last say so. Not arguing with someone, does not mean they are right. It just shows that you are choosing not to put forth time and energy into negativity. You are taking the high road. If you have trouble in this area, try and pause for a moment and let God direct you.
Luke 12:12 KJV
For the Holy Ghost shall teach you in the same hour what ye ought to say.