We have to face the problem. When misery arises in the mind, face it.
By observing it objectively, you go to the deepest cause of misery. If you can learn to observe the deepest cause of misery, you will find that layers of this deep-rooted cause start getting eradicated. As layer after layer gets peeled off, you start to be relieved of your misery. You have neither suppressed your negativity, nor expressed it at the vocal or physical level and harmed others. You have observed it. Doing nothing, you have just observed.
Anger
When someone is abusing me, it is that person's problem, not mine. If they are abusing, it means that they are generating negativity in the mind. This person is a sick person, an unhappy person, a miserable person when he is generating anger and shouting. Why should I generate anger? Why should I shout and make myself miserable?
This understanding can not come unless you have experienced it. It is like the experience when you touch fire and learn not to touch it again. Similarly, you can develop the ability to observe what is happening inside. Anger has arisen and you will immediately notice that there is fire, and it has started burning you: "Look, I am burning! I don't like burning. Next time I will be more careful." Or, "No, here is anger. If I generate anger, I'll burn."
By mistake you have again generated anger, again you observe it. Again you generate anger, and again you observe it. After a few experiences, you start coming out of it.