Why provoke it? Do you honestly think such a response makes you any better than him? That was more of a brown nose response there.
I have came across many Cabin crew who look fairly depressed in their roles... I couldn't do what they do especially when you have petty passengers arguing over seats, drinks and silly airline policies.
It's sheer ignorance of you to conclude that every cabin crew in the world are rude. Having worked in a customer service role myself, I fully understand how much of an affect one bad customer can be on your day.