Oppositional defiant disorder. That rare but curious phenomena whereby certain children are difficult to put a finger on, and can react in mystifying ways. Probably most perfectly described by this post over here.
Note the genetic reference, and the comments at the bottom. One from ThePonderfamily ends thus ” …Good luck! Its sucks to be the parent of an ODD child.” Another from CaitlinBrooksMusic, says ” I had to get rid of a friend who had bipolar disorder, and who screamed and swore at me and called me a b***h several times! That’s terrible! ”
And yet another sees punishment as the way to go ?
Can’t help but wonder what Jo Frost would say?