The author describes a vivid and unsettling image of a gumdrop's appearance when digested, equating it to a horrifying sight. This metaphor illustrates the unpleasantness of something that is often perceived as sweet and enjoyable turning into something repulsive.
Furthermore, the author expresses frustration at being cautioned against overindulging in something that is not appealing or desired, emphasizing a tension between societal expectations and personal preferences during the holiday season. This sentiment captures the dissonance between festive traditions and individual feelings.