So this is interesting. It was inevitable though, that something like this would happen. I flew a couple of weeks ago and use my phone in "Airplane Mode" and it worked great. Nobody complained, but I did wonder if a flight attendant would ask me to turn off my device, etc.
Fortunately, I had no problems. Clearly, this flight attendant was mistaken on the technology and how it works. It's unfortunate that it happened. Hopefully thought it will educate others in the airline industry. Click on the picture to read the article in detail.