How is it revealed in this chapter that class structure and race is important to the people of Stanton?

Aunt Hager and Sister Whiteside first talk about Sandy and Sandy's friend Buster, who was half-black and probably had a white father. They then talk about Tempy and her husband who have done well financially and have stopped hanging around lower-class blacks with darker skin. In general, it becomes clear that Stanton largely has three social classes, whites, lower class and mostly darker blacks, and then lighter-skinned middle class blacks. Middle class blacks often seek to distinguish themselves from lower-class blacks to gain the approval of whites.