Evil people feel no remorse. They think they have every right to treat you however you want. "Truly evil people don't just hurt others. They take pride in the pain they cause and then try to blame their victims.
This can be hard, but DON'T DO IT! And I am speaking to myself as well. It is never good to repay evil with evil, for in God's sight it's not pleasing. So next time someone does you wrong, pray for them and mean it.