Holo-Net fanboys were fat lazy people who watched the Holo-Net all of the time. As all they did was watch the Holo-Net, they had a very high IQ, averagely it was thought to be 1666. Listening to a Holo-Net fanboy was thought to be incredibly boring, as they knew pretty much everything and liked to explain it all.

Ratchet & Clank wiki
For those without comedic tastes, the so-called experts at the Ratchet & Clank wiki have an article about Holo-net fanboy.