Well, then, you weren't looking at the same definition I was. Doing it just for the sake of it, is exactly what I meant, in reference to yourself. It seems, when you get a little ticked at someone, you start being a contrarian, just for the sake of it.
This is the sense in which I was using it.
contrarian (kənˈtrɛərɪən)
— n
a contrary or obstinate person
http://dictionary.reference.com/browse/contrarian
A contrarian is a person who takes up a contrary position, a person who seems to be "contrary for the sake of being contrary,"
http://en.wikipedia.org/wiki/Contrarian
You can change that to obstinate, if you like or argumentative.