As-salamu alaykum sister,
While I do not know all the details of his home life or if he is in school, it sounds as if he may have been exposed to behaviors which he is exhibiting, thinking they are acceptable. I would kindly suggest monitoring what he watches on TV if you don’t already. Even cartons can be violent. If he is in school, ensure his friends are not of the same behaviors. Set limits and implement discipline. Whenever he acts out, stop him and tell him “no” and tell him it is not nice nor acceptable to act this way.

If he continues, set a punishment. Whether it is taking him away from the playgroup, taking away a special toy, or making him have down time-do it, and do it consistently. Insha’Allah after a time he will associate his negative behaviors with a negative consequence and the behaviors should start reducing. At the same time, whenever he does something kind, or plays nicely, reward him.

He will also associate acting kindly with getting something nice in return. Lastly dear sister, while some of this is normal in children, if there is anything at home that may be influencing his behaviors, please address it. Children can easily pick up on stress, anger, sadness or other emotions in the home or at school, so examine his environment as well to ensure it is not a participating factor. While I am sure he just needs some strict boundaries, rules and consistent disciple, if it continues despite your efforts, please have him evaluated by his pediatrician.