elso:

But, Simon is being raised to believe that nothing should ever deviate from his expectations. He has been taught that his wants and needs are above everyone else's. If this isn't true, than why was he eating the other children's snacks when he couldn't find his own?

Why indeed? Maybe because he asked, and they were nice enough to share with him? Or maybe one of the other helicopter moms felt sorry for him? Or maybe he slapped the shit out of another kid and stole his snack?

Plenty of options, but not all of them support him being a sociopathic egomaniac.