God hates gossip, slander, and other forms of maligning people. God wants us to love our neighbors – not treat them hatefully by talking about them behind their backs, or, even, insulting them to their faces. When God is using a difficult person to sanctify us, the goal should be to allow that person to be used by God to help make us holy; not to tell them off or to be the one that gets the last dig. We do not want to miss the whole “Sovereignty of God” concept in our sanctifying relationships. Instead, we want to remember that the Lord divinely appointed all the difficult people in our lives, so that we can learn how to be more like Jesus who “When they hurled their insults at him, he did not retaliate; when he suffered, he made no threats. Instead, he entrusted himself to him who judges justly” (1 Peter 2:23, NIV).
Taken from Walking In Newness of Life (p.87).