I would not say its a fetish, but a fetish can be attached to it. First and foremost its simply a liking for antro characters in e general sense.
And about sexuality, which is certainly the point where people show the most hate. Furries are into human based fanatsy characters with a wild mix of features, from nature inspired to completely made up and that with a great emphasis on the human base of the character.
Finally people involved generally seem to be social outcasts.
A great amount of us are aspergers, me as well. We are by nature social outcasts and the target of everyone that can somehow have power over us. So its neither getting worse nor better.