That's not true. Being overtly self-aggrandizing to women is a turn off. It makes sound like you are trying too hard to impress her. (Cockiness works, but not overt boasts).
Men do need to be more aggrandizing in professional life. Men do not carry a baby to term and nurse it for years. All they bring to the mating game is wealth, status, and genes. Thus, professional success is much more important in order for a man to attract a mate. Thus men are much more aggressive and do whatever it takes to rise the ladder.
On the flip side, when a women is self-aggrandizing it is quite a turnoff to a man. It much more actively harms her reproductive success. So women learn not to do it, and that rubs off in professional life.