[Emily walks out onto the patio]
EMILY: What is this, a refugee camp? Come inside and eat at the table.
LORELAI: Mom, the whole point of barbecuing is to eat outside.
EMILY: Animals eat outside. Human beings eat inside with napkins and utensils. If you want to eat outside, go hunt down a gazelle. Make your decision, I’ll be inside.
More of Emily’s repressed, WASPY-y attitudes to eating, where pizza is something you only eat in a Turkish prison, and eating outside is something for animals or people in refugee camps. I can only think this attitude comes from country club barbecues, where the food would be cooked outside by the catering staff, but served indoors at tables like any other meal.
You can see how a lot of Lorelai’s poor dietary choices come out of a rebellion against her mother’s strict views on what foods are acceptable. Note that Lorelai and Rory immediately begin gnawing on corn cobs while hunched over in a corner, exactly like wild beasts, or starving people, comically fulfilling Emily’s expectations of what eating outside does to someone.