Recently, a White Woman from Texas, Who Would Quickly Describe

Recently, a white woman from Texas, who would quickly describe herself as a liberal, asked me about my hometown. When I told her that in Stamps my grandmother had owned the only Negro general merchandise store since the turn of the century, she explained, "Why, you were a debutante." Ridiculous and even ludicrous. But Negro girls in small Southern towns, whether poverty-stricken or just munching along on a few of life's necessities, were given as extensive and irrelevant preparation for adulthood as rich white girls shown in magazines. Admittedly the training was not the same. While white girls learned to waltz and sit gracefully with a teacup balanced on their knees, we were lagging behind, learning the mid-Victorian values with very little money to indulge them. (Come and see Edna Lomax spending the money she made picking cotton on five balls of ecru tatting thread. Her fingers are bound to snag the work, and she'll have to repeat the stitches time and time again. But she knows that when she buys the thread.)
-Maya Angelou
-What is the paragraph's main idea?