Agree. If they say, "put that away", be done with it and chalk it up to relaxing on the plane without photos. If you start discreetly shooting photos after they say, "no", or if you starting fighting with them (like when a police officer pulls you over), you're going to lose. Just put the camera in your bag and relax.

Try never to capture faces of people, and try to be discreet. Don't photo for 30 seconds with your hands up in the air like a tourist shooting pictures of the stature of liberty. Just photo your food, seat, etc., and you should be fine.