Behind each struggle lies another one that is much deeper. In any confrontation between two views, each side holds a bit of the truth. Gandhi saw honoring the truth of both sides as the way to resolve conflict. The purpose of fighting is to sort out the truth and untruth in yourself. One should fight to stand in good accord with one's own conscience.
Fear can weaken the resolve to fight.
Avoiding conflict regarding an important principle can be cowardice. Inaction at the time of necessity is inexcusable. The first rule of nonviolent action is to refuse to cooperate with any action that is humiliating. Verbal abuse is always humiliating as it is nonrespectful towards the other person. When you are being screamed or yelled at, leave the situation, noting that you will return when things have calmed down.