If beauty consciousness in girls can be said as peer pressure then geek/nerd consciousness in boys can be said as peer pressure as well. Boys who don't play videogames or watch sci-fi/action movies or listen to some complex rock/electronic music genre or those who are not gadget freaks or those who're not into science/technology/engineering in general are seen as less masculine (at least in a first world society).

I think the reason why femininity is looked down is the economic models of the last 150 years which have favored science over art, rationality over irrationality and utility over authenticity. I think the world needs a second romantic era to truly appreciate the feminine aspects of beauty/creativity/genuineness.