When beings behave spitefully toward you, this verse teaches you to give that person the victory. Let them be the winners and allow yourself to be the loser. When you get hurt by other people and can accept their inflictions without retaliating you stop their negatives acts.
The law of cause and effect dictates that for every effect there is a cause. The harm we experience in this life (the effect) is the result of the harm we have brought onto others in previous lives (the cause). If we can accept harm that is inflicted upon us in this life without retaliation we stop the pendulum.
Think about it like this: “What will be the benefits if I retaliate when harmed? What will be the benefits if I do not retaliate, but manage to work it out within myself?” Reflect on this and come to your own decision.