A major element of whether one is selected for invitation into closed, snooty clubs (or promoted into management) is whether there's a suspicion that you'll invite too many (presumably not deserving) friends. People who are "sticky" don't get promoted. People who might tip off their reports about an impending layoff aren't made managers.
You have to be cold, for organizational ascent, but not a dick.
In environments of heterogeneity, warmth is actually an advantage because people who are personable and giving tend to have a wider array of connections, and that means more information, better ideas, and an easier time staying up to date. The old Silicon Valley actually was that way, but for the past 20 years, it's been functioning as one (however postmodern) corporate organization.
I've come to the conclusion that the only way to save Silicon Valley is to pass a law that makes investors liable for certain kinds of founder misconduct, including sexual harassment. For example, a frat boy like Spiegel would actually probably not get promoted in a larger corporation, if his true colors came out, because he's an HR liability. But investors can fund people like him and wash their hands of the cultural issues created by funding frat boys. That's a real problem, and it ought to be fixed. Since founders are middle managers in the VC-funded meta-company that now exists in the Valley, it's only reasonable to acknowledge them as such, and pass liabilities up the chain into the executive ranks (investors).