I don't have any inside knowledge here, but I recognize flight attendants to be professionals, mainly based on their behavior. Even if this article is 100% factually correct, the "facts" here are simply a collection of statements uttered (perhaps casually, flippantly...) each by one flight attendant, then attributed to an entire profession. Hey, it sells "newspapers", eh? The value here is that it may make passengers think about their behavior: e.g., look over the drink list in the in-flight magazine and don't ask the flight attendant to recite it to you.