Actually, Kiddo, you're totally wrong. You don't understand that we poke at you and have absolutely no feeling at all. We're annoyed by some things, yes, but there's no real emotion involved when you passionately argue your point of view with us. You do not shake our beliefs, no matter how much you wish you did, either.
littlemissgiggles is right that it tends to be the result of a huge onslaught of consistently having no control over anything. The less control or the more controlled we are in ways we don't like, the more likely it is that you will finally find our threshold. It can take a great deal for some of us, though. I've only snapped twice, and it took months of constant crap and nothing going according to plan before I finally snapped.