It's a bit different when the flirt in question is flirting at you. And I must admit, it's disconcerting being flirted at by someone of the same gender. Some young women just do that sort of thing naturally. It's probably genetically programmed and from the point of natural selection advantageous. But who knows?
Flirting in women is a bit like charm in men: not to be trusted. It requires an acceptance of the courtesies inherent in 'chivalric' behaviour: it is impossible to flirt if you might be assaulted. It assumes chaps are gentlemen (in the best sense of the word), and is therefore a compliment of a kind.
Humans and compliments, even convoluted ones.....a statement that doesn't need a corollary.