When things escalate to the point that Darlene can’t take it anymore, she leaves so that she can “wear shoes and salt everything at home.”
As it turns out, Becky might have a point.
They argue over how he put a lot of effort into trying to make sure she could relax and not worry about anything once she got there, and Darlene counters that he should simply let her enjoy herself the way she wants to.
Eventually, when she’s stirring the paella he made for them in an effort to keep the peace and be helpful, she tastes it and tries to add salt to the dish he’s been working on for hours, and everything boils over.