A chronically angry and bitter person often feels short changed in life and blames others for his problems. This is using anger as a defense and a rationalization for blaming others. This is not healthy or appropriate anger. Specificity is a good measure of appropriate anger. It is tied to an event or situation that can be specifically described.
Assertive behavior prevents aggressive behavior.
Assertive behavior protects one's rights and feelings, whereas aggression attacks someone else's rights and feelings. . .