[There's some confusion starting to enter his expression; he's getting the feeling that they're not talking about the same things here.]

[But it's not a strong enough feeling yet for him to, you know. Stop arguing and try to figure it out calmly.]

I do not see where humans came into it at all. I suppose some of them could be called monsters, yes, but that is still because they are unpleasant. It is what the word means.