nag 'n brag
You complain about something you paid for, get a free item or discount, and then you brag like you're the best person ever.
I yelled at my hotel for not cleaning my room, got a free upgrade, and now I call myself the hotel king.
I screamed about my coffee being too hot, got a free pastry, and now I say I'm the coffee queen.
I ranted about my meal being too expensive, got a discount, and now I brag like I'm the restaurant king.
xs