I think it’s silly the way some people love to call psychopaths “reptiles.” Denying our very humanity, as many more like to do, isn’t enough for this select group. Of course, if we’re reptiles, we aren’t human. And it means we’re not even mammals. I guess they can’t take our detachment so they are mentally detaching us from all categories of beings they feel any connection to.
The association of reptiles to evil is an old one in our Judeo-Christian culture. The first evil invaded the paradisaical Garden of Eden in the form of the serpent. Eve was a mammal, a member of the human species. So, I guess she was intrinsically good. But the evil serpent made her do something wrong. That’s the equation. Human = good. Reptile = evil.
And so it has been from time immemorial. Look at Harry Potter. The students are divided into four houses. One of them is identified with reptiles. Slytherin.