From my admittedly third person perspective, I wouldn't classify it a "hate site". A "lolcow" (or who they classify) tracking/doxxing hub, sure. Completely unhinged, sure, but I dunno if I'd consider it a "hate site" specifically...I'd also saying writing it off as just hateful really doesn't do it justice, for how bad it really is.
If anyone's interested in a broad overview of the history/point of KF, I'd recommend reading the first paragraph of Section 2.