You can't change someone who doesn't see an issue with their actions. You can only change how you react to them.
Ungrateful people complain about the one thing you haven't done for them instead of being thankful for the thousands of things you have done for them.
People will hurt you and then they act like you hurt them.
Most often, the people who criticize your life are usually the same ones who don't know the price you paid to get where you are today.
KARMA. No need for revenge. Just sit back & wait. Those who hurt you will eventually screw up themselves & if you're lucky, God will let you watch.