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Is there a name for when the audience leaves because the guy who just came on stage has bad reputation? I can think of a few real life instances where someone at the UN general assembly left because a dictator or some other "great enemy" was given right of speech.
I can think of Leaving Audience covering that as well. For a more specific trope you ought to ask in Lost and Found.
Moving this example here because it is doesn't give a specific example.
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How well does it match the trope?