Part of that is Brent's doing, part of that is likely hesitance about going "acshually i need help from you" right from opening the door. Yes, Nicki is trying to make the request appealing, but why should this outweigh that she genuinely needs help, and that this help isn't even going to involve any sort of a sacrifice on Guy's part?
It's kind of like a starving person (that you knew for a long time) coming to bakery and asking for a loaf of bread, and you go on them "YOU ARE TRYING TO MANIPULATE ME BECAUSE YOU KNOW I'VE GOT LOT OF FOOD. FUCK YOU, NO BREAD FOR YOU UNLESS YOU PAY WITH YOUR ASS".
Which is to say, focusing on the wrong thing, imo.