Ill play devils advocate here...
If I am in a plane (which belongs to someone else) and the staff explains that the plane was overbooked, therefore; they will be selecting at random who gets to return their seat (after incentives were offered with no effect). You better believe that I would be departing the plane if I get to be the lucky "winner" (as pissed as Id be). Disobeying security at the airport is about as stupid as challenging a cop in the street. It is just not the place to do it.
I dont care if the guy was a doctor, carpenter or a priest. Do as you are told while on someone else's property. Then later, escalate as appropriate through the correct channels.
http://www.dailymail.co.uk/news/article-4401980/Dr-dragged-United-swapped-drugs-secret-gay-sex.html