I believe this story is a CCP false flag.
I'm not buying the Chinaman snapped and punched a female flight attendant twice in the face.
Chinese have no problem wearing masks.
This advances the anti maskers bad narrative and drums up sympathy for the brown shirt flight attendants.
https://www.dailymail.co.uk/news/article-10139751/American-Airlines-passenger-punched-female-flight-attendant-twice-face-dispute-masks.html
Ackshully, I believe it's a placebo.