It has to go
It's important to let go of the anger, bitterness, rage, and everything else mentioned. Here's why. You holding on to it and feeling it doesn't effect the other person. It only effects you. When you hold on to it your mental, spirit and physical take a hit. You become stressed out. You end up angry at every little thing. You don't have to become friends with the people who cause you to feel such ways. You don't even have to like them but for your sanity, your peace and your health. Forgive, let go and let God deal with those individuals. We have to be very mindful that the devil will uses people to execute his plan to try and destroy you any way he can. Be mindful that spiritual warfare is real. We often try to fight the battle in the physical causing us to stress, anger, be bitter, and holding on to things were not even suppose to be carrying. Not realizing it's a spiritual battle. So I encourage you to put on the full armor of God and before you try to go to battle in the physical you go to God in prayer. It's a spiritual battle. Truly Peace, Truly love and Truly happiness.