What the contrast between Lois and Margaret in Old Story Time?

Lois is Len's wife. She is loving, misjudged, and craves the attention she deosn't receive. Lois is dark skinned, and for this reason, Mama doesn't approve of her.

Margaret is a white women, and the daughter of a minister. She is unkind and vindictive, as she participates in George's humiliation of Len.