Ask him why not. Suggesting it's "womens' work" isn't a real answer, only an opinion. You might as well say you won't drive to buy groceries because driving and refuelling a motor vehicle is "mens' work", as is switching on ovens and other electrical equipment, throwing out garbage, and so on. Every adult and teenager sharing a home should take some responsibility for the upkeep of that home; it's the civilized way to live. Sharing of responsibilities should be tempered with consideration for each persons' other responsibilities such as hours of outside work, job pressure (this includes working as primary caregiver to children) and so on.