It's perfectly normal for a person to hesitate to read a book because it has something he doesn't like on the cover.
do you think it would be offensive if I said I didn't like a certain rap album because a black guy made it?
yes
yes it would be offensive
granted furries do not actually compare to a human race (whether or not some furries think they are a different race)
how about if I said I didn't like Stephen Hawking's books because he's in a wheelchair