Stephen offered grace to the people that surrounded him. The people weren’t fellow Christians. They weren’t offering him kind words. They were his attackers. The very ones that stoned him to death. Still yet he was gracious toward them by showing them compassion and praying for their souls.
As Christians we are told to not only grow in the knowledge of our Lord but also to grow in grace. (II Peter 3:18) For a Christian, the level of grace you offer people is an indicator of your growth in the Lord.
Don’t balk at opportunities to be gracious to others. Instead view the trying relationships as opportunities to grow in our Lord.