Instead we are to bless them. Jesus doesn't stop with blessing them. We go out of our way to be extra nice. We speak highly of them. We may go so far as to bring them a small gift.
Most people are hurtful to others because they are full of hurt.
We need to pray for them. To help them with their hurts and maybe even change them. We will make a difference in our attitudes. We will make a difference in the lives of those who see us acting like this. Most of all, we can make a difference in that person life.