Firstly, I think you need to forgive yourself. Like the others have said, it seems you have been much more affected by your reaction - and that is all it was (a once off reaction) than your son.

Rachel might be right - does he need further investigation? - diet change or something else or is he like fionas said (I giggled a little) just a 'Sillypants'. He might be very outgoing & needs fostering that in a different way that most kids do ie: painting, dancing, singing! rather than reading, watching TV. You never know he might end up being an actor/performer on stage Best of luck