Faved because of Qrow's smile.
The smile says he has successfully prodded Winter into acting like a woman with feelings instead of being the ice-cold warbot her commander wants her to be.
Yang: There's Uncle Qrow doing what he does best.
Ruby: Doing what, Yang?
Yang: Adding to his bad luck with women.
Weiss: Eh, what?!?
Blake: They do seem to know each other well.
Ruby: Bad luck?
Yang: I'll explain it when you're older.
Weiss: No explaining!!! there is nothing to explain!!