Humans can be a kitty's worst enemies or greatest friends. They feed you. They change your litterbox. And sometimes they even let you sleep on the bed!
There's also things that look like humans, but aren't. Pixies look like really tiny people, and Naiads look like really... wet people? They're sort of humans, but not quite.
This is about humans as foes, which is why there's different term (Humanoids) being used to describe this group. There's also humans that belong to Magical Kitties.