You should always give young children a chance to grow their confidence, let them win, don't strive them with failures after losses, help build their self-esteem, that's what we should do as matured adults.
But if they shitting little buggers, best to kick their ass and put them in their place.
The Good Doc - Deviously Teaching Humility One Punk At A Time
easier said than done, they're pretty good at the game