In the passage from "Birds of a Feather" by Jacqueline Winspear, Maisie highlights the distinction between having lunch with a gentleman and dining out in the evening. This implies that the social significance and context of the two meals differ, reflecting societal norms and expectations regarding meals shared with others.
Billy counters Maisie's observation by pointing out a practical difference: dinner typically offers more food than lunch. This exchange illustrates not only the contrast in social experiences but also touches on the more casual and substantial nature of dinner compared to luncheon outings.