I venture some comments with trepidation, since people seem to have very strong views on this subject!
Some people just moan about everything. Our great British tradition.
Yes, that's probably why "Britain stood alone" during the Second World War! Surely, Bodie, you are not suggesting that people should unquestioningly accept whatever "the authorities" tell them to do?
Just wear the bl00dy hi vis and shut up.
Not a very pleasant or constructive suggestion, I'm afraid. Perhaps a brief review of some Dale Carnagie principles might be in order:
#2: Show respect for the other person's opinions. Never say "You're wrong".
#4 Begin in a friendly way.
#8 Try honestly to see things from the other person's point of view.
#9 Be sympathetic with the other person's ideas and desires.
P.S. For whatever it may be worth, I have never seen anyone wearing any high visibility clothing at small airports here in North America, and we don't seem to have any problems.