People will not always respond like they should.  Sometimes they will be totally mean in return for kindness.  We do not have to keep a list.  We do not have to get even.  God notices.  Proverbs 17:13 states that if you repay good with evil, evil will never leave your house.

Prayer for evil doers is the best thing we can do.  God will take care of those people in His Own timing and His Own way.  However, He will take care of us in His Own timing and His Own way based on our response to the evil done to us.

The decision is ours.  Do we plot evil against the ones who wronged us?  Do we lift them up in prayer asking God to make them more into the likeness of Christ so they can be a better blessing to others?

Luke 6:37

Do not judge others, and you will not be judged. Do not condemn others, or it will all come back against you. Forgive others, and you will be forgiven.