Well this isn't part of my list (which I'm just making up as I go) but let's consider this an honorable mention.
101: Gratuitous overuse of the word "Fanboy"
For gamers especially. There needs to be more of a line given to distinguish fans and actual fanboys.
A Nintendo fan: Prefers the Wii to 360 and PS3 and will give his reasoning.
A Nintendo fanboy: Has absolutely nothing positive to say about Sony or Microsoft, has a strong disrespect for third party companies and still holds a grudge against Sega as if he just caught Sonic the Hedgehog f*cking his mom.