Yes it would be great if every human being could be nice, and friendly all the time. However even the nicest FAs have their days. Not to mention that in the service industry, when a customer does not receive something they think they will get, the Crew member is automatically rude.

Remember that when told the word "no", people will think a FA is being rude, or lazy. Passenger wants to go into the first class cabin, then said FA says "no". Passenger automatically equates that to being rude, unfriendly, or bitter. When the fact is that the passenger has no right to be up there, and people paid good money for privacy.

I've encountered miserable and bitter people in all industries, but I'm not going to sit here and say that every person in that particular industry is miserable and bitter. I think it's unfair, and shows ignorance in the fact that the airline industry is not what it use to be.

Surveys show that when the airlines gave out complimentary amenities, passenger satisfaction was up. Take those amenities away, and all of a sudden satisfaction was down, with passenger complaints up. Who were the targets? You guessed it! You see people need to put a face to the airline, and when not given what they want, will use whatever means possible. No upgrade? You're rude! I want your name and social, so I can write a letter and receive miles that I'm entitled to!

Anyone being nice and friendly all the time is not humanly possible, especially when you encounter someone who is not happy, and is angry at the airline, and the world.