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I would ask them for their input. Get them to participate to understand what that gesture really means. Once they have been heard then the topic is open for group discussion. Groups will often help you with negative participants.
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Elisabeth Swan

Elisabeth is a Master Black Belt at, the co-author of The Problem-Solver’s Toolkit and co-host of the Just-in-Time Cafe. For over 30 years, she's helped leading organizations like Amazon, Charles Schwab and Marriott International, Inc. build problem-solving muscles with Lean Six Sigma to achieve their goals.