It's not a generic "defiance to authority", as I understand it's more like anyone trying to exert any kind of authority over you is bound to generate a kneejerk

It's not a generic "defiance to authority", as I understand it's more like anyone trying to exert any kind of authority over you is bound to generate a kneejerk negative reaction, big issue or small, reasonable or not. Could be a parent, supervisor, partner, teacher, cop, etc. ODD is not related to an actual battle against your oppressors.