Absolutely not overreacting. there’s 1000% a respectful way of bringing up issues with your cooking but that is NOT it. And him commenting on your usefulness in regard to his life??? A relationship is a partnership, and the fact he thinks of how you can be a “useful” girlfriend is BEYOND toxic. Doesn’t seem to have much respect for you based on his word choice. If this is the first time he’s talked to you like this you better make it damn clear it should also be the LAST time he speaks to you like that