Fallacy:
According to "The Infoshop Anarchist [Anarcho-Socialist] FAQ", Anarcho-Capitalists aren't real anarchists, because historically, anarchists were communist/socialist!
Response:
See Richard A. Garner's Response To The Anarchist FAQ which addresses the fallacies in said "FAQ" in detail, and "Are libertarians anarchists?" which addresses a specific, common fallacy from the "FAQ".