Here are 4 Bible verses about mean people from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
James 1:20 KJV
For the wrath of man worketh not the righteousness of God.
Luke 6:28 KJV
Bless them that curse you, and pray for them which despitefully use you.
Proverbs 22:24-25 KJV
Bless them that curse you, and pray for them which despitefully use you.
Proverbs 16:4-7 KJV
Make no friendship with an angry man; and with a furious man thou shalt not go: Lest thou learn his ways, and get a snare to thy soul.