Both of these people were customers to him, and since they were customers, there was no distinction to be made. He wasn't some sort of private chef who could cook for one person and not another by saying it was a disturbance.
The Third Holy Mother, seeing the expressions of Chen Nuo and Goddess Nuwa, realized she must have misspoken again and explained, "No, what I mean is, this is Goddess Nuwa's reserved time, and it really isn't right for me to impose now. That's why I thought of declining. It's not that I don't want to eat the dishes made by Shopkeeper Chen."
This was essentially like tossing the ball to Nuwa.
