Nope, Niko was an Old World boy offered a drink from a friend and he was taking it, even if it seemed nonsensical. And as Sans was speaking, he did indeed squeeze that ketchup packet into his mouth. When in Rome or whatever.

"Had to watch out for him even at home, huh?" He asked, wadding up the packet when he was through and putting it in his pocket, and then opening up the next one.

It seemed, though, somewhere in there Sans was a romantic. He heard that note of wistfulness. Niko was one, too, and wondered if there was someone that the squat skeleton man had missed a chance with, by necessity or misfortune. ...Or both. Seemed to be the luck of a lot of people.