Anger is a natural emotion all of us experience in response to a perceived threat to or a violation of the self. We all have the right to be angry. In fact, not being able to express it can be harmful to the health and to our relationships. That sure does not mean we go around screaming at people we are angry at.
The way people react is conditioned by the social and psychological development. Anger is determined by the conscious and the unconscious mind, and this would influence the way people express their feelings, including anger.