What is the theme in Talley's Folly by Lanford Wilson?

One of the hurdles Sally and Matt have to overcome if they are to be a couple is the intolerance of those around them. Sally, although she is white, Methodist, wealthy, and reasonably attractive, does not fit in with her family or community because she does not embrace the capitalism that has secured her family's fortune. She has been fired as a Sunday school teacher for encouraging her students to think positively about labor unions. Perhaps most scandalous to her family, Sally is still unmarried at thirty-one, and rather than being disgraced by this she has grown content to be alone. Because of the unwillingness of her family to embrace different ways of thinking, Sally's only pleasures come outside her home, when she is at work or with friends. At home, she is lonely, an outcast.