Not relevant now, but more than 30 years ago standing by for an LH flight out of HKG, the very German station manager absolutely refused to allow me on their flight, cos my hair was a bit too long! I had to go into the toilet with a razor and hack off the excess, watched by puzzled locals, before he'd allow me to board.

As a result, for the period of my career where I was in res or ticketing, I did my best to avoid booking people on LH flights, or using them for reprotecting from our cancelled flights. Made me feel a lot better.