I guess you don't know many people who work in tech in SF, then... companies regularly list office beer as a job perk along with the snacks and pingpong. In fact, I've never worked anywhere where drinking wasn't a significant part of the culture, including office drinking, during office hours (at least on Fridays).
Uh, actually I work in the SF and Valley tech scene and know it intimately and extensively. You somehow want to have us believe this is a widespread and accepted practice - it's not among any reputable groups.
The liability issues alone make "listing" drinking alcohol at work during or after office hours as a "job perk" even more moronic.
But do feel free to list right here on HN the startups who proudly list beer drinking during office hours on office premises as a "perk".
There are many of us who do business in the tech world who will consider that a public service announcement of organizations to avoid doing business with.