A person who doesn't just arrive late to everything, they arrive late to everything and expect congratulations for arriving at all, special treatment, and prizes.
Who does Blaine think he is, Cher? You cannot walk into one of Brecht's parties three hours late and demand a blunt in a pina colada wrapper, your own bottle of Veuve, and a foot massage!
Girl, didn't you know? He's a total fashionably late-anista.