I maybe an exception to the stereotypical software engineer, but I work best around motivated people rather than people who are laid back all the time.
There is certainly nothing wrong with working at a time of day which is most productive for you, but the implication was that midwesterners were generally unwilling to put in a bunch of extra hours to "get it done." Not that they frowned upon people who liked to work at night.
I would argue, pretty strongly, that the culture of "kill yourself working a billion hours a week for your startup" is unhealthy physically, socially and mentally. Sure there is an outside chance that you hit it big and get fabulously wealthy. In the mean-time you pass up tons of actual real-life salary, benefits and vacation time that are tangible, usable, and increase your quality of life today. (Not to mention an actual retirement account, which most startups seems to neglect.)
Out of politeness I'll leave you beer, etc. comments alone.
As for the other statements, come to a hackathon or a Startup Weekend and see how motivated we really are.