it works, and the hotter the girl is, the better it works. You can also point out a flaw, or just mention that theres something on their teeth/nose/face/wtv, it just breaks their confidence, and when you do that to a hot girl, who's used to been seen as perfect, she'll feel that her "hotness" didnt impress you and will therefore become interesting to her because you'll appear to be the confident hard to impress type of guy