Fatebound - Celtic metal

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Puzzle:
Spot the Bigot!
We have 1000 politically correct employees. However, one of them in secret supports free speech! In company's antihatespeech unit we have 10 brave agents of who, when contradicted with opposing views, will get traumatized and start showing symptoms in 24 hours. As these agents are highly unreliable and prone to miscommunication the symptoms are the only reliable way to observe information. Agents can have a quick chat with any number of the employees they choose. How can we find the impostor in 24 hours (chatting is assumed not to consume any time)?
Celtic metal
Gothic metal
Viking metal
Haunting dark opera music
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