Video: Teetotal elderly United passenger who 'tapped flight attendant on the elbow' amid seat mix-up claims she was labeled 'belligerent', kicked off plane and put on a WATCH LIST - two years after man was infamously dragged off

Moments before he was brutally dragged from his seat, Dr. David Dao can be heard in this video arguing calmly with a security official on United flight UA3411.