The only time "clumsy" carries any weight or consequence, is when operating machinery or doing physical tasks. If he was driving a bus then did his arm gesture

The only time "clumsy" carries any weight or consequence, is when operating machinery or doing physical tasks. If he was driving a bus then did his arm gesture causing an accident, we could call him stupid. When humans communicate with arms flapping in celebration and excitement, clumsy arm movements are not a safety issue or significant in any way. I suppose you could always manufacture outrage about arm movements, then campaign and argue that others should adopt that outrage?