Any hyper focused group, especially one that has an excluded "other", will form a totem idea of that other and unreasonably become extremely against that totem. So hate spirals out of control. This occurs on either ends of the political spectrum. It can happen with sports teams vs their rivals.
My flippant response is to ask why such a commonly asked question isn't part of the lecture. Though maybe it was touched in briefly and easily forgotten.
Abalone.