says who –
What most people here are saying is that a parent’s decision to or not to push ahead their child comes from a perspective of “chanoch l’naar al pi darco” not from a desire that their child should be “the best in the class”
I feel for you that people are hocking you about your son. If indeed your son is ready – socially, academically and otherwise, than be confident that you are doing what is right for your child. Try to smile and ignore your well-meaning (albeit annoying) friends.