I actually wrote about this a short time ago on my student blog. I started by confessing an embarrassing anecdote.
Too many years ago to mention, I yelled at my roommate's son to stop acting like a child. The poor kid. He was so confused. He said, "But I am a child!"
Now, if the airline had asked passengers not to be angry, I think they'd've had a leg to stand on, albeit a weak one.