It may be that even if you remain a humble, honest, and contented person, some of your friends, neighbors, coworkers, or rivals will take advantage of you. To simply allow this is unreasonable. Under such circumstances, you must first clearly understand that the other person is a human being and has a right to be happy.
With respect and compassion toward that person, you can act according to the circumstances she has created. This means responding strongly if necessary, but never losing your compassionate perspective.
In fact, compassion is the only way to handle such a problem, since anger and irritation will only hinder effective action and complicate things. At first it is difficult to maintain compassion for someone who is being threatening or hurtful, but if you try again and again, you will find the way to react as strongly as the circumstances demand but without losing a loving attitude.
It is like the relation between a kind parent and children. Sometimes the child becomes stupid and naughty, and in order to stop that behavior, the father or mother acts -- in accordance with those circumstances -- with harsh words, perhaps even punishing the child, but without losing compassion. That is the way to handle the problem.