Does he have any playmate or does he get the chance to interact with kids of his age most of the time? You may try exposing him to kids of his age so he can observe how they behave. You can show him examples of kids who are obedient to their parents and ask him about his thoughts on what he sees with other kids. Maybe you can gauge from there why he is acting extra 'aggressive' as you've mentioned. You may also check what kind of environment does he normally see and what kind of people surround him.
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