We’ve all had people who just irritate us and “get under our skin.” When we let people get under our skin, it causes us to have toxic thoughts which can turn off certain genes in our DNA.
“Through our thoughts, we can be our own micro surgeons as we make choices that will change the circuits in our brains. We are designed to do our own brain surgery and rewire our brains by thinking and by choosing to renew our minds.” 
Jesus told us to pray for those that hurt us. Why? I believe it causes us to think right so we will not have toxic thinking happening in our brains. It helps “US” to pray for the good of others.
Luke 6:28 (AMP) says, “Invoke blessings upon and pray for the happiness of those who curse you, implore God’s blessing (favor) upon those who abuse you [who revile, reproach, disparage, and high-handedly misuse you].”
-Pastor Chapter 3 “Switch On the Brain” by Carolyn Leaf