(After I did some research:) Ahhh. It appears "Buffistas" are specifically the filk Buffy fans, that is, people who compose poems and songs to express their fanniness. If you (wisely! ha ha) decide to punt this one, might I suggest Insane Clown Posse –> Juggalos as its replacement? I was very surprised that one wasn't on there to begin with.
Assuming nerd and geek the same is just silly. Though there might be sóme resemblance, the two things are nothing like eachother.
Kinda surprised there aren't factions like Prequelites, or Original Jedis though, given how they bicker. Just see a lot of "You aren't a REAL Star Wars fan if you do/don't like the prequels/sequels/extended universe..."