Be nice.....
Remember one thing Treat others as you wish to be treated !
Cabin crew are NOT you personal slaves and Just because you have bought a Ticket does not mean that you OWN the airline nor are you the only passenger !
At the end of the day the cabin crew are only HUMAN and wish to be treated that way.
And at the end of your flight remember that the cabin crew have just had to put up with a lot of people and may be tired and believe me its hard to be nice when your knackered!
Paul