Feigning superiority over another person and then gather a following of others as justification for doing so. A weapon of mass destruction that has killed more people than all the wars combined.
The racist said to another racist:
"I hate you because you have blue eyes" and 50 people with blue eyes were hung.
The other racist said:
"I hate you because you have black hair" and 50 people with black hair were hung.
The third racist said:
"Wtf you guys are white, you should die then" and 100 white people were hung.
Later, all the racists were hung for crimes against humanity.
The inability to understand or comprehend someone else's point of view.
Person 1: Insert controversial subject here
Person 2: That's what you think.
Ignorant person 1: No, you are just stupid for saying that.
Ignorant person 2: At least I know I'm right.