Just note that signs of independent thinking aren't at all interpreted as someone having a personality disorder. The fact that those things might superficially sound similar is like lamenting the fact that fairly common and normal things, like having a small lump on the skin, is a "sign" of having terminal cancer. The point is that ODD is defined specifically by the disobedience and inability to follow instructions occurring at a greater frequency and intensity than the average person, that it significantly affects their ability to function in everyday life, and has occurred consistently since childhood. In other words, someone who questions authority is never going to be diagnosed with ODD. However, someone who pulls out a knife and threatens to chop the heads off his sisters because his dad asked him to pass the butter at breakfast most likely will.