It's impossible to judge without being there. One of the great things about CX (as opposed to some other airlines) is that they allow the FAs to be themselves rather than some standard "company robot". So like any people in real life occasionally they will make errors of judgement. If you had been chatting / flirting with the FA then I can imagine situations where this sort of comment would be just part of that, but since you feel it necessary to bring the question here I guess she misjudged the situation slightly.

I had a similar thing today where a senior purser in J was frankly a bit overly "frisky" with all 3 of the gwailos in her cabin, and was a bit too direct in comments about hoping for laisee. But it's not a big deal. (*)

Personally, I would rather that happened occasionally than that the service was without any individual character.

(*) And she has my phone number if she wants to discuss it further