Normal teen behavior serves a purpose in preparing the person for the adult world. Eventually, it will pass. For the child with ODD, this is not just part of the process. This is a way of life. Similiarly, all mental health is a continum, with one end being extremely healthy behavior and the other being extremely unhealthy.
ADD is a prime example.
All people show ADD traits of impulsivity and forgetfulness at some time. But, people with ADD exhibit these traits to the point where they begin to interfere with their everyday living. We live at the extreme end of the continuim of human attentiveness- or inattentivness, as the case may be. All children argue. ODD children argue to the point where it is a very real interference in the way they live and in the lives of those who live and work with them.