Where does Griffin say racism comes from? What are three examples from the book?

Toward the end of the novel, Griffin decides that until whites and blacks begin to communicate effectively, little will be done to mend race relations in the South. While Griffin sees the cruel and unfair treatment that blacks are subjugated to in the South, he also noticed that blacks know very little about whites. They therefore have their own prejudices against whites. In the case of the young black youth who helps Griffin to clean out his office, he notices that the young boy thinks every white person hates him. He is confused by other whites and Griffin's kindness. As he has only been around whites who have called him bad names or treated him negatively, he has judged the whole group.