Not to knock you, your writing here is very complete and often entertaining. BUT...
What I wrote was just a post. I included two examples in it. They were not the basis of the post, merely intended to illustrate the point which you summed up so nicely with "nerd is pejorative while geek is not."
I admit that I failed to grasp how completely "geek" became synonymous with "hipster". I had no idea that "geek" basically meant "everyone with an iPhone". In light of this, I would stand by my earlier definition of "nerd". It's still a more extreme version of someone who considers themselves extreme in some way, but really isn't.
I keep editing this so as not to come off as trollish as "So really, you don't possess the ultimate truth like you pretend. " which is the single most offensive line I have seen on Io9 short of "Paprika was a great film", but I see what you mean and point taken.
How could it be any more clear? The first example is a comment about a contemporary example of the nerd rage. The second is only unclear if you aren't familiar with the terms 'slacker' and 'Lego'.
I disagree about the changing definitions, unless you're talking centuries and not merely years. Geeks have always liked "off center" things, and nerds have always gone too far and ostracized themselves in the same interest.
Oh, so you're one of those guys who can't tell a nerd from a geek and goes around lumping them together, eh? Do that with any other two groups and get stabbed to death.
Here's the deal, NERDS complain about the color of Superman's briefs. GEEKS know what the hell the nerds are talking about, but stop there.
Geeks are slackers that admit they like Transformers. Nerds build transformers out of Lego.
I want to say I've seen it in use on the Japanese show "Gaki no Tsukai ya arahende", and if not, it was a close approximation. The clumsiest member of the cast got scared and fell down, cracking a fake foam wall, then a T.Rex burst into the hall through it. Scared everyone stupid.
Why am I explaining this... this show has Matsumoto Hitoshi, the creator of BIG MAN JAPAN! Everyone knows Matsumoto Hitoshi.
When I saw them live, a guy pogo'd onto my foot three times and I gave him a shove the last time. Later on, during 'shoehorn with teeth' one of the John's evil eyed me when he sang "tour the world, with a HEAVY METAL BAND" as if to chastise me for "moshing".
Paranormal Activity seen on home video was boring as hell. I imagine it was better in the theater, where they showed an entirely different movie called Paranormal Activity.