Even though you were right and the F/A was wrong, I wouldn't bother getting into a petty argument so early in the flight, because I'd be worried about poor service as "revenge" later in the flight. Did that happen to you?
Well the mystery is solved...Poor Service is REVENGE!!!
If not for something you did today, for something you may possibly do in the future or someone else has done or will do!
It all makes sense now!!
Sad but true, IME.