Bad traits or just bad attitude??

One of my sims rolled childish, mean, and evil. I thought she would be more fun, but she has a decent reputation, is never mean to her husband, and is only occasionally mean to her child. The child bit adds a sentiment, but nothing major and it goes away.

Honestly, if you don't have mods that change that behavior, then the traits do very little overall and the task of making them act a certain way will fall to the player.