a right cunt
A right cunt is someone who gets to be a pain in the ass because they think they're better than everyone else, even if they're the worst at their job.
My dad is a right cunt. He says he's the boss, even though he can't remember his own password.
My landlord is a right cunt. He charges me extra for a leak I didn't cause.
My friend is a right cunt. He claims he's the king of the school, even though he failed math.