What is the meaning of this excerpt from "Everyday Use" by Alice Walker?

"In real life, I am a large, big-boned woman with rough, man-working hands. In the winter, I wear flannel nightgowns to bed and overalls during the day. I can kill and clean a hog as mercilessly as a man. My fat keeps me hot in zero weather. I can work outside all day, breaking ice to get water for washing; I can eat pork liver cooked over the open fire minutes after it comes steaming from the hog. One winter, I knocked a bull calf straight in the brain between the eyes with a sledgehammer and had the meat hung up to chill before nightfall. But of course, all this does not show on television. I am the way my daughter would want me to be: a hundred pounds lighter, my skin like an uncooked barley pancake. My hair glistens in the hot bright lights. Johnny Carson has much to do to keep up with my quick and witty tongue."