Why do we get upset and argue about petty things? It is usually because we want to be right and want our way which is selfishness. The solution to this problem is love. We have to learn to love, be in peace and live in harmony and to love with all we got. We have to love other more than we love being right or having our way. This will be a hard process, but we can do it.
It 1 Corinthians 15:31 Paul says I die daily. Dying to self is something we are going to have to do on a daily basis for growth. It may hurt our flesh to adapt or adjust to someone else instead of fighting to get our own way, but in the end we will reap a life of peace and joy which is the great reward.
"Becoming a Better You" 