Intolerance is a major theme in Harper Lee's "To Kill a Mockingbird," and it manifests itself in a variety of forms throughout the novel. In Maycomb, Alabama, the setting of the story, racism and prejudice are rampant, and these attitudes are reflected in the actions and words of many of the characters.
One of the most prominent examples of intolerance in the novel is the racism that is directed towards Tom Robinson, a black man who is falsely accused of raping a white woman. Throughout the trial, Tom is treated unfairly and with contempt by many of the white characters, including the prosecutor, who openly displays his belief that Tom is guilty simply because he is black. The jurors, who are also white, ultimately find Tom guilty despite the lack of evidence against him, further demonstrating the deep-seated racism that exists in Maycomb.
Another form of intolerance in the novel is the prejudice that is directed towards Boo Radley, a reclusive neighbor who is considered by many to be strange and dangerous. Despite the fact that Boo has never caused any harm or trouble, the children in the neighborhood, including Scout and Jem, spread rumors about him and make fun of him. This intolerance towards Boo is fueled by fear and ignorance, as the children know very little about him and are therefore quick to judge him based on their own preconceived notions.
In addition to racism and prejudice, there is also a significant level of classism in Maycomb, with the wealthy and influential members of society often looking down on those who are less well-off. This is exemplified in the character of Bob Ewell, a poor and abusive man who is treated with disdain by many of the other characters. Ewell's social status is used as a means of dismissing his accusations and behavior, and he is ultimately depicted as being beneath the notice of the more prominent citizens of Maycomb.
Overall, "To Kill a Mockingbird" serves as a powerful commentary on the dangers and consequences of intolerance. Through the experiences of Tom Robinson, Boo Radley, and Bob Ewell, the novel illustrates the ways in which hatred and prejudice can lead to injustice and harm, and encourages readers to strive for understanding and acceptance of those who are different from themselves.