What are the factors that go into how an ai feels toward the player?

I'm playing on Masochistic (and having a rough go of it) and no matter how much tech I throw at the Korx, nor the fact that I am militarily superior will stop them from declaring war on me for no good reason.

I remember reading that the best way to stay out of harms way was to make sure that your military rating wasn't the lowest in the game. So why do the Korx attack me instead of a lower civ?