He is against furries, and certain 'art' that might be considered furry art by some (Of course, excluding that which is explicitly so) can be enjoyed, assuming that the person viewing said art has knowledge of what is and is not moral according to it.
For example, let's say as an example that I like the movie Fantastic Mr. Fox. It is not 'furry art', though many of the characters are anthropomorphic animals. It is not intended to explicitly BE furry art, and the main value of the art is in the story and characters, not their design.
TL;DR: It's not furry art because it's not explicitly so.