Paul said, "Do everything possible on your part to live in peace with everybody." Peace always has a price tag. Sometimes it costs our pride; it often costs our self-centeredness.
You cannot fix the problem if you're consumed with fixing the blame. The bible says, "A gentle response defuses anger, but a sharp tongue kindles a temper-fire." You will never get your point across by being cross. A soft answer is always better than a sarcastic one.