How does Offred`s request for hand lotion reveral the differences between Offred`s and the Commander`s situation?

On the third night she asks the Commander for some hand lotion. He laughs when Offred tells him the Handmaids use butter to keep their skin moist, which infuriates her. She leaves the lotion in his office so that it will not be found in her room. The commander enjoys whatever comforts that he wishes while the Handmaids must humiliate themselves with butter as skin softener.