Later in the book, Minnie and Aibeleen talk about the "lines" between classes and between races. They disagree. Minnie says,
"Not only is they lines, but you know good as I do where them lines be drawn."
Aibeleen shakes her head. "I used to believe in em. I don't anymore. They in our heads. People like Miss Hilly is always trying to make us believe they there. But they ain't."