While he works at the A&P (the largest chain of grocery stores from 1915 through 1975), Sammy perceives the customers as "houseslaves in pin curls" with varicose veins that "map" their legs. He also sees them as "sheep" distractedly pushing their shopping carts down the aisles.
These women are dehumanized because of their repetitive and mindless routines. In fact, Sammy imagines them as animals. Two customers, for example, are likened by Sammy to frightened pigs in a slaughter chute as they vie for first place in the checkout line. So, when the young girls enter the store in their swimsuits, Sammy perceives them as a refreshing change from the usual customers. To Sammy, these girls are independent and vibrant.
When the manager of the store and Sammy's boss, Mr. Lengel, accosts the three girls in their swimsuits, telling them that they must leave the store because they are in improper attire, Sammy envisions Mr. Lengel as a representative of "The Establishment." Further, after listening to Lengel lecture the girls about proper attire, Sammy decides to quit in a rejection of the "stuffy" values of the management and as a gallant act in order to impress the girls. Unfortunately for Sammy, his gesture goes unnoticed by these girls, and he stands outside realizing "how hard the world was going to be [for him] hereafter."