The great thing about this post is that the stereotyping is done around a characteristic that can be easily changed, namely your email domain. I imagine Hunch can back up much more controversial and populist stereotypes.
Data from Hunch proves it: there are distinct personality and demographic clusters associated with the most popular email domains (AOL, Yahoo!, Hotmail, Gmail). So choose wisely! This blog post from Amanda Green also includes a new interactive stats feature that's fun to use.