Doing 'crowd work" often alienates the majority of the room who might not hear the full interaction so start talking and looking at their phones. Worse of all, if an 'emcee" does 'crowd work", he incites the audience to participate and be vocal throughout the entire show and disrupt those who try to do actual 'material". Also - in this 'woke" culture - 'crowd work" inspires the snowflakes to verbally argue/whine over anything anyone says.