You should have done something.
And to everyone here who has had an overt lack of respect done to you (the spoon kid) or seen someone just act like a complete ******, you should do something. Publicy embarrass them with a smile so that everyone knows how much of an *** they are, or a slob, or just with a lack of respect for someone older and/or younger.
I always, ALWAYS will go up to a parent of a child and try to embarrass the child infront of their parents, most of the times the parents are embarrassed and apologize to me and then you hear under their breath "OMG HOW COULD YOU...I WILL..." and if they don't I make it a point to then "pass it forward" and contact someone who works there and embarrass the entire family.
If someone dropped their nachos on the floor I would politely tap them on the shoulder and say "excuse me, you dropped your refuse on the floor can you please put it in a garbage so nobody steps on it or no animals gather and eat it?" and if he or she refused I would get out of line (leaving my fiancé there to keep the space) and get someone from Disney to come over and then say loudly "excuse me, that man (or woman) in green just dropped their garbage here instead of putting it in the trash, can you have someone come to clean it up so nobody steps in it?"
Public shaming is the only way people learn