I think its only because many/most people see flights as stressful unpleasant environments, not conducive to meditation or quiet relaxation. I don't think its a sign of masculine strength or whatever to sit through a shitty flight with no distractions, but its not "psycho" either, I'm sure it works for some people. Shit sometimes I've done it accidentally, it's the bragging about it and telling everyone about how many jealous DMs you get that is really stupid.