There are initiatives doing both of those things, luckily. Little Miss Geek, Technovation, et al for the first; and various changes including anti-harassment policies for the second (though some companies/events remain quite "bro"-y). Not to say there shouldn't be more of them, or that more hacker role models aimed at all genders and demographics in the early teens aren't needed. There are also more visible female tech role models than there used to be, from Marissa Mayer to Sheryl Sandberg -- but that doesn't stop 15 year old girls drawing a spotty, overweight, badly-groomed man as their idea of a "technologist" when asked. (source; Little Miss Geek TEDx talk)

I also want to point out on the lowering standards front, I'm a female hacker who's been coding since age 6, and I was rejected from YC. I'm actually proud of that fact in the light of this discussion. I'd hate the whole foundation of my startup to be the source of such rabid debate, and for folks to think I just got in because I'm a unicorn and we need more unicorns in tech.