I'm still not sure if this is actually a "nerd" argument, but it's my favorite:
I once got in an nerdy argument while eating dinner with my wife´s family. I and my sister-in-law (who isn't a nerd) where discussing what was better - movies based on books or the books that the movies where based on. I was of course speaking for books' superiority, she was advocating the movie medium.Others involve sexy Muppets, Harry Potter's love life, pooping on the holodeck, breasts on the Dragonborn, and Batman vs. Gandalf.
One of her argument where that movies where great because it helped the books publicity. Her example for this was that NO ONE HAD HEARD ABOUT THE OBSCURE BOOK 'LORD OF THE RINGS' BEFORE THE KEWL MOVIES CAME OUT!!!!!! I got so angry that I called her an idiot, said that I couldn't stand being in the same room as her and stormed out in the room. I did this in front of my wife and my mother-in-law. Not a very proud moment.
But man, thinking about it still makes me angry.
Find the winner here.