Furries are some of the most rude and aggressive people I've encountered on the internet.
Also, the premise of their fandom loving disgusts me.
Sorry that you've only seemed to encounter the bad ones, but it really is a kind group overall. It's the bad ones that tend to get the most attention is all.
Also the fandom isn't based around anything "officially," there is no premise other than I suppose anthropomorphic animals, which I doubt disgusts you.