I'm not suggesting that you did argue with the FA, I am questioning why something posted on an internet forum, not a reliable source of info, can really help you. Even IF the FA is wrong and you know it, where do you go from there? Disobeying the legal order of the flight crew is sub optimal, an interesting part of the ANO is that the legal order does not need to be correct, merely that the person giving it believes that is in the best interests of the safety of the flight. So other than for interest how does this help?