Encourage children to see their strengths as well as their weaknesses. Help them to see that they can reach their goals. Make failure and setbacks part and parcel of life. Sometimes children do aggressive or destructive things to force an adult to get involved and pay attention. Older children may have angry outbursts when frustrated by difficult tasks, like studying.
Parents can move in, offer help, and praise the older child for their efforts.
Especially such stupid names. When situations change, tell the child directly. When your headache is gone, let them know they can go back to what they were doing before. Sometimes a child can't stop himself or herself once a tantrum has begun. We often control our own behavior by doing this.