OZcabincrew,
As an S/O I must have heard comments like "Oh enjoy your six hours off" or "Off to bed again are we?" at least 100 times. The best response was of course "Thanks, I will enjoy it, and if you want six hours off go and get your pilots licence." I learnt very early on not to interrupt any magazine reading or bitching in the galley unless I wanted to be treated with utter contempt.