Kool kidz klub:
The hot girls
Cheerleaders (Subset of hot girls)
Jocks
Kids who got popular for no particular reason
Some band members
Wannabe rappers
Everyone else:
Hipsters
Stoners (Hang out w/ the hipsters)
Geeks
Nerds
Freaks
Goths/Emos
Effeminate guys
People who probably use 4chan too much (They're not too hard to distinguish)
Normal people who can't be classified
Have yet to see any furries, but I have seen some bronies