What is the right thing to do if your mates tell your girlfriend in public to "chop chop get into the kitchen"?

Imagine your mates, your girlfriend and you are the only people in your loungeroom. She is the only girl present. Everyone is joking around. Jokingly, one of your mates lightly insults your girlfriend by telling her "chop chop get into the kitchen", as a slightly sexist remark. What is your appropriate response? Or do you overlook this slight on your status as her boyfriend? What do you think is an appropriate response as the girlfriend? And as the guy?