Unfortunately, this is not restricted to EK. I've had the exact same arguements at BA, although not for a few years and I've always has the back up of the CSD. Bottom line, it's my galley, my food and my pax. I'm the one who has to deal with them if they don't have their choice because a crew member ate it. I would always make sure Flight Crew had something left over from First if I had anything available, out of comraderie rather than obligation but really, what can they do if they are refused something they are not entitled to? That said, these situations are few and far between, at least at BA.