because they just wanna be jerks online but dont know who to bully so they choose us because zoophiles exist and they think all furries are the same as zoophiles -_-
depends for each anti-furry. for some, it's becuase they have no life, for some, it's becuase they think all furries are zoophiles, and refuse to admit they're wrong, and for some, they just don't like furries.