I Believe... [Get Your Feet Offa My Plane!]
...that it really is completely unacceptable to get on a five-hour flight, take off your sandals and put your bare feet up on the seat in front of you. My response was simply to look at him and his feet and say "No. Not gonna happen." He put his sandals back on.
How do you want to be defined? By one action? By some opinion that could evolve? By a mistake, regrettable only with hindsight? Or by the sum of your parts? Okay, do that for other people. Start the trend.