It's rude to spit out your food.
Tommy's older mother spends an hour cooking brussel sprouts for Tommy.
Tommy can't stand his brussel sprouts and doesn't want to swallow them.
When mom isn't looking, Tommy takes the sprouts from his mouth and gives them to the dog.
Tommy spits out all his brussel sprouts onto his plate and verbally denigrates them.
Tommy's mother thinks he ate them and smiles and is happy.
Tommy's older mother feels awful and sad and hurt by Tommy.