This thread title is offensive. Anyone with any understanding of history knows that thinking of others as less than human leads to inhumanity to other humans...
During the Holocaust, Nazis referred to Jews as rats. Hutus involved in the Rwanda genocide called Tutsis cockroaches. Slave owners throughout history considered slaves subhuman animals. InLess Than Human, David Livingstone Smith argues that it's important to define and describe dehumanization, because it's what opens the door for cruelty and genocide.