A twat who claims he's only behaving like a twat in defence of the fact that other people keep calling him a twat behind his back.
Similar to a self-fulfilling prophecy but more personal, and often used as a defense mechanism, usually by men to avoid ever having to engage with anyone emotionally, or say sorry.
Their phrase of choice should you ask them why they're behaving like a twat is of course: 'Are you calling me a twat then!?' and then centre all their twatness upon you as you obviously must be the source of why everyone thinks they're a twat, and are no longer inviting them to any more social events.
I can't be bothered to try and make sense of the man anymore, he just seems to be a self-fulfilling twat.