Michael doesn't strike me as the "cooking at home" type. Even for this party, it's Emory who brings the food, right? Michael seems to be providing the alcohol only. If Michael only uses his kitchen once in a blue moon, he probably doesn't feel like it's a priority to do anything with it. We know he doesn't have much money and the money he's spending that he doesn't have seems to be going on clothes, grooming products, and, probably, the rent on this amazing apartment.