The Silicon Valley startup ecosystem depends on venture capital. If VCs are putting in money, they want to see a return (and a big one, because of the expectation that nine out of ten companies, at a minimum, will crash and burn). And they want to see it ASAP, because that’s how the time value of money works, and because companies are burning money like liquid hydrogen as they try to achieve lift-off. So there’s an enormous pressure on founders to produce, which inevitably selects for people who are prepared to sleep under their desk for the chance of having a breakout company (and, not incidentally, making an enormous return for their VCs, who are presumably sleeping soundly in their nice Design Within Reach beds). The system doesn’t select for women, for people who have families or lives outside of work, for thoughtful people. And by not selecting for them, it actively pushes them out, creating a culture that rejects and is intolerable for them (witness the much-documented sexism and ageism of tech culture). On top of all that, we as a culture socialize boys to be over-confident in themselves and to be deeply messed up about gender, and then there’s the Dunning-Kruger effect, and then we give them a bunch of money. So it’s not surprising that tech bros (or be both more precise and less ad hominem, techbro behaviors) come out of this system.
Source: Metafoundry 4: Indicator Species