If one's expectation leads to an outcome of disagreeable quality, is it not simply a case of the imperfect union between contradictory thoughts and/or actions, ie being human? Maybe .. I don't know ..
Discussion
It is my action that leads to outcome with my expectation somehow informing my action. Indeed, not knowing is key to experiment and experience. When I ponder how much my own taste was formed by that which has been fed to me, I do try to be a little tolerant, just a little.
And yet tolerance is an insult by another name .. which leads us back to the question of seeking apologies from the parent(s) of a child, whose actions have prompted the notion of intolerance from the inflicted party .. maybe the imposition of a little decorum is not such a terrible idea .. maybe ..