A gentle response to an angry or defiant act seems weak and out of place. The Holy Spirit has a different perspective:
A gentle answer turns away wrath, but a harsh word stirs up anger. (Proverbs 15:1)
The Hebrew word for gentle here means the quality of being tender, soft, delicate in substance. This is not exactly the first response that comes to mind when someone you know or your teenager opposes you. There are two natural responses when this happens. Both are equally wrong and destructive.
The first is to fight fire with fire, to let others know you won't stand for their behavior. The second is to be hurt and withdraw either in fear or humiliation. But the Holy Spirit says to offer a gentle answer. The goal here is to soothe and comfort that listener. (See Ephesians 4:29.) An angry response only serves to inflict pain and encourage even more upset. This is what is meant by a harsh word stirring up anger.
Once again we see that God's ways are not our ways.
When your teenager approaches you in anger, the Holy Spirit urges you to respond with the power of gentleness. It is his fruit, his way. It takes great courage to put aside the defensive response of anger or hurt and instead extend the love of Christ to one who, at that moment, is unlovely.