Fanbrat

A fanbrat is a young, immature fan of any series, or someone who behaves as such. Fanbrats are usually preteens, although not all young fans are considered fanbrats. Fanbrats are most commonly found in any fandom aimed at their demographic, such as Disney Channel shows, but can also be commonly found in anime and other fandoms. They tend to try to make up for their lack of life experience by behaving as obnoxiously as possible. They are the fandom equivalent of 'n00bs,' tending to lack basic knowledge both of their fandom and how to get along with others in the fandom community.

Referring to a fellow Boarder or PPC Agent as a fanbrat is a grave insult. Should you wish to be eviscerated for some strange reason, that would be a fairly reliable method.