Seems to me that Mario put himself in the 'daddy' of the house role with LIsa as 'mummy'... and in the last couple of weeks he's stepped out of that role and is now trying to be hip and cool and in with the youngsters. He's trying so hard to be a 'lad', that 'muff' stuff in the diary room to Luke who is young enough to be his son was just absolutely revolting and sick.
Add to that he's a bully, has an overinflated ego, is totally deluded about himself and gross to look at and there's not much that redeems him!
