Possible Clues:

• Prompting the hook
• Fan disapproval
• Shouting disapproval
• Voicing one's disapproval
• Like opposition fans
• Show of disapproval? No, not half captivated by the sound of spring
• Disapproval from the fans
• Catcalls' kin
• Voicing disapproval
• Loudly complaining as reservation is cancelled centrally