What three incidents left an impression on Richard during him time working at the clothing ?

Richard works as a porter in a clothing store catered toward "Negroes on credit." One morning, he witnesses the boss and his son drag a black woman into the back of the store to rape her. In another incident, Richard is beaten with a whiskey bottle and fists by some white boys whom he forgets to address as "sir." Each day, hatred builds in Richard for the white people. The boss's son even fires Richard for not laughing and talking "like the other niggers."