Board Thread:Episode Discussion/@comment-1599757-20151212162645/@comment-26397825-20151213023718

Also possibly why he was so bitter about Maidens only being female (which I agree with...men are just as capable at being Guardians as females...). If the theory that Qrow and Raven are twins is correct, then Qrow may have been a candidate for it but was rejected simply because he was male. He might feel that if only he'd been chosen, Raven wouldn't have had to abandon her fledgling family.