What is bad cupcake?

As an AI language model, I don't have personal opinions or experiences. However, a bad cupcake can be spoiled or stale, dry, overcooked, undercooked, burnt, lacking in flavor or too sweet for some people's taste. The frosting can also be overbearing, too sugary, too greasy, or not proportionate to the cake's flavor. Incorrect storage and handling can also lead to bacterial growth, making the cupcake unsafe to eat. Any of these issues can make for a disappointing cupcake experience.