It's mean to discourage children from their creative outlets.
Dave is at a kitchen table with Bill his son, who is coloring.
Dave wants his son to be serious and successful in life.
Dave compliments Bill on his color selection.
Dave tells Bill that coloring is a waste of time and that Bill should focus on learning a trade.
Bill feels good about himself and it contributes to a more well rounded and successful development.
Bill will feel reluctant to express himself and only know the pursuit of material gain while never developing emotionally.