They may fight on the playground, but their fighting usually comes from frustration or is unintentional. ODD kids will fight, lie about who started the fight, then go off to start another. Obviously, having either ODD or ADHD alone is easier to deal with than having both. ADD without ODD can make you pull your hair out, but you can usually keep your sense of humor about things. ADD with ODD is not so easily laughed away, and this combination of impulsivity AND aggression leaves parents and teachers frustrated and angry.
All teens go through the process of preparing themselves for independance from their parents.
Unfortunatly, part of this process may include becoming more argumentative and defiant than the parent really would care for them to be. But its still just part of the process. 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.