On a weekly basis my DSs pre school is telling me about some sort of aggressive behaviour our 3 YO is engaging in. I'm really unsure of how to tackle this. He is an only child so we don't see much of this at home but when he is challenging or not doing as he is told, I get him to look at me and firmly tell him that he mustn't behave this way. He often smiles or starts reciting something from a TV programme or book completely off topic in response. DH keeps suggesting things like a naughty step/time out but this doesn't sit right with me.
Really open to ideas on how to get through this and show him that this behaviour is not acceptable.