6yr old asshole

It's sad but my 6yr old stepson seems like a narcissist asshole. Nothing I do is ever good enough, he tries to boss us around, has no fucking manners at all, food is never cooked how he likes it, nothing is good enough then when he sees I am so upset after he causes arguments between my husband and I, then he wants to hug and kiss and be sweet and lovey...if he was an adult pulling that shit he would be considered an asshole.no matter how we approach it or how hard we try to teach him he still acts this way. My son who is 10 never acted like that,never, he has an attitude at times but he never acted this bad. I am lost. I am tired. I don't even want to be around the kid.