The best part about this scene is Jim being so proud of himself that he managed to buy all this healthy stuff even though he had to spend most of the money with the stuff Spock asked for.
But Spock is so cranky, and who can blame him? He’s building an advanced machine that’ll help them get their asses back to the future with the little resources he has while Jim is cheating on him. So he just complains to Jim about how much he needs platinum.
And Jim is like “You ungrateful bitch, I just brought you all these goodies, I’m also doing the best I can”.