Explain the metaphor in the poem "Stamps" by Bethlyn Madison Webster?"Stamps" by Bethlyn Madison Webster

In "Stamps" by Bethlyn Madison Webster, the book of
foodstamps become a metaphor for the class division of the woman, her baby, and husband
against the woman with the "Cheerio" mouth and pink fingernails who purchases rib eye
steaks.  As the husband pulls his public aid stamps from his pocket, the woman hastily
grabs her purchases and glares at the food that is to be purchased with these food
stamps which represent the tax money deducted from her income for public aid.  She
haughtily sneers at the chocolate, thinking that the people do not need this.  Thus,
with their food stamps, the three people become to her the lower class whom public aid,
her tax dollars, support; they are despicable, lazy people who do not deserve chocolate
or potato chips.