Jesus taught that everyone should be kind to all people, even to people who mistreat us.

Matthew 5:38-42

38 “You have heard your religious teachers say that it is written {Moses wrote}, ‘Retaliate like this: If someone damages one of your eyes, someone should damage one of that person’s eyes. If someone damages one of your teeth, someone should damage one of that person’s teeth.’ 39 But now listen to what I say to you: Do not take revenge for evil deeds done {that other people do} to you. Instead, if someone insults you by striking you on one cheek, turn your other cheek toward that person in order that he can strike it also. 40 If someone wants to sue you and take your ◄inner garment/shirt►, give him your ◄outer garment/coat► also. 41 If a military authority compels you to go with him one mile and carry his gear, go with him two miles and carry his gear. 42 Also, if someone asks you for something, give him what he is asking for. If someone requests you to lend him something, do not refuse to lend it to him.”