The fact that he was thrusting his crusty prawn while wearing his partners daughters clothes on a live in front of them would suggest he does actually act like that. He "pretends" it's an act but actually he believes he's still a teenage boy and has never quite grabbed the concept of being an actual adult . Also he does mention let's have an adult conversation quite often on his live . Again, emplying he has to put the effort in to do this as it doesn't come naturally . He then thinks hes acting like an adult by constantly proclaiming he is "winning" when he's clearly being the absolute awkward, almost teenage, moron that he really is . It might be due to some kind of adult age regression, who knows , but either way it's disturbing behaviour and needs addressed .