A toxic person is defined as an individual that cannot be pleased. The difference between toxic and nontoxic behavior is the approach. How they deal with negative is the issue. The manner in which they treat others is what defines them as toxic. Every one seems to know someone who is toxic. What if the toxic personality is a spouse, boss, child, or in-law? The objective is to stay in control of oneself and to define his or own life as a good person and not be defined by the toxic. The challenge is not to let toxic people cause you to become as toxic as they are.