It's what the good book says. Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord. Romans 12:19 KJV https://bible.com/bible/1/rom.12.19.KJV
Indeed! Sometimes tough calls have to be made. I have a simple word. Contempt noun the feeling that a person or a thing is beneath consideration, worthless, or deserving scorn. I cut out all relationships with contempt involved as soon as I can. Haven't felt better since I started doing that.