To do ought good never will be our task,
But ever to do ill our sole delight,
As being the contrary to his high will
Whom we resist.
— Beelzebub speaking in John Milton's Paradise Lost
It seems to me that to be defined by the will of another, whether contrarily or not, is just another form of slavery. As long as one tries to act solely in rebellion, one is as much a slave as the one who is wholly obedient.
Rejection is, I think, a similar thing. When we reject something, we admit that it still holds some thrall over us; if it did not, rejection would not be needed, and we could just move on.