I've very occasionally had this happen with respect to helicopters. I've explained about the 500ft rule, and apologised for those of my fellow flyers who break it. I've agreed that helicopters are noisy and gas guzzling, said it's a shame that they are, but they really are tremendous fun, and also save lives etc. Would the person like to come up with me so I can show them what I mean, I ask? That sort of non-confrontational approach always seems to work, especially if you buy the next round.
