My 3 year old can be a bit naughty at times -nothing malicious, just a bit mischievous i suppose. However if he is told off this seems to crush him and he says that we don't like him (it can also reduce him to tears which is sometimes a dispropportionate reaction). He then wants to be alone and will take himself off to another room and closes the door.it takes quite a while for him to then thaw out. Is this normal-ish behaviour or is this something to be worried about?