You all assume that those who have no interest in Humans must have an interest in non-intelligent animals.
It's because you specify that it's humans you have no attraction to. Like if the topic is your favorite animal, saying "I don't like cats" incites people to ask "Oh, so you like dogs?" They take in the new information, which is that you like cats, and apply that to the relevant pool of information to get out a result. Taking humans out of the pool of "things people are loveually attracted to" leaves mostly animals since generally people don't consider inanimate objects capable of being loveually desired.