They win when you react in a way that is not your authentic self. I am glad that I am no longer (as) vindictive–but have surely paid for wasted time trying to get even or try to make them understand hurt they caused me. I tried to “give them what they had coming” and hurt myself, my morals, my beliefs, and wasted my time.

Well said Seaisland. I think you are right on the money. Staying mature with an immature adult is the challenge for all of us.
And as Anita suggested, ignoring these people is the best policy as we just get on with our lives.