I'm such a Geek that I'm actually going to propose a subclassification for the Beer Geek definition...
Here's a Geek Hierarchy that I find amusing:
Geek - Understands, creates & fixes 'really cool stuff'.
Nerd - Understands & collects 'really cool stuff'.
Dork - Confused by 'really cool stuff'.
And I think it works for beer.
The die-hard geek is obsessive about all the technical things. They'll dissect every aspect of a brew and take detailed notes. Think "homebrewer".
The beer nerd has a good understanding of all the different styles and is obsessive about 'ticking' as many samples as possible. Think "comic book collector".
The beer dork aspires to be accepted by all the nerds, but only has a very basic understanding of the topic. That's not to say that they're dumb, they're just very eager, but inexperienced. Think "that guy in the office that has read a short article on craft beer, picked up a few different samples, then spouted off about how crazy these wildly different beers are (though they're actually timeless classic styles)."