What does it mean when a crowd whistles at a bullfight?

When a crowd whistles at a bullfight, it typically expresses disapproval or dissatisfaction with the performance of the matador or the overall event. Whistling can indicate that the audience feels the bull was not challenged enough or that the matador did not demonstrate adequate skill and bravery. It serves as a form of feedback from the spectators, emphasizing their expectations for a more thrilling and engaging display. In some cases, it can also signal that the crowd wants the bull to be released without being harmed.