He really isn't, but Noctis did it mostly so Ebony wouldn't insist further with the entire jar. He saw that gentle nudging of the container towards your plate, Ignis. Also he really can't say no to Ivory. It's a Problem.

Though at that comment, he looks super offended.

"Hell no." Ignis, no. It is the first of two things he absolutely refuses to eat. Don't do this to him.