Non-jews are not a different species of people, as I was shocked to find when I started college, straight out of seminary. They have personalities just like we do, and you might even identify with them and even (shocker) like them. However, it’s still important to keep a healthy distance.
The Gemara suggests that the Shichvas Zera of a Nochri has different properties from that of a Jew, since the Nochri eats non-Kosher foods and is physically affected by his diet. The Chasam Sofer (Teshuvos YD 175) writes that this Gemara is relevant in practice. He rules that we cannot assume that a medical treatment that was tested successfully on a Nochri will also be successful on a Jew. Rav Elyashev shlita pointed out that the Chasam Sofer writes that the physical characteristics of a Yid are different than a Goy, and that what applies to one may not apply to the other. Therefore, said Rav Elyashev, how much more so regarding the mind/soul?