While I agree with you in general you are wrong in this specific case. There is a small cadre of extremely vocal and demented posters that do hate KF, BF and anything associated with them. They obsessively post attacks on KF and BF. Not criticisms, personal attacks that range from juvenile and stupid snark to accusations of all manner of personal misconduct. They post it on virtually every football topic. They post it in probably most basketball threads. Certainly a lot of basketball threads.
Repeatedly, and often viciously attacking people goes way past criticism. Indeed, obsessively posting the same redundant attacks several times a day, every day is itself a manifestation of hatred. The desire to just beat up the same people day after day for years is pretty much the operational definition of hatred.
There is a point where criticism, even fair criticism, becomes abusive. I don't know what you do for a living so let's say you are a retail/household plumber. If I and say 10 other people went to FB and Yelp, every day for years, and said Jonesy is a shitty plumber, a complete incompetent that is trying to destroy your home plumbing and his #2 guy is so inept he shouldn't even get paid. Every day. For years, I never miss a chance to voice my criticism. After a point wouldn't you think I hated you? Not just pissed about the toilet you didn't fix but actually I see you as the problem.
That is what actual personal malice looks like. People can and do try to justify it and hell, some of these guys could probably pass a lie detector if asked are Iowa fans. But the constant repetition of the same attacks tells a very different and much more accurate story.