Why do white people get upset when I tell them that Rock and Roll was invented by a black man?

Charles Edward Anderson "Chuck" Berry (born October 18, 1926) is a guitarist, singer, and songwriter, and considered one of the pioneers of rock and roll music. Chuck Berry refined and developed rhythm and blues into the major elements that made rock and roll distinctive, with lyrics focusing on teen life and consumerism and utilizing guitar solos and showmanship that would be a major influence on subsequent rock music.