Nonsense.....yes, but then again we are a nonsensical species and therefore it is perfectly natural to say things like that.  You don"t meet a stranger in a bar/club and say "i fancy you" (unless you are drunk maybe). You give them an in with a woolly sounding compliment that they have to read between the lines abit to get (but not too much). Then you can test the waters and see whether they reciprocate without leaving yourself too open to instantaneous soul crushing rejection.

It"s like a mating dance.