How does racism affect the life experiences of characters in the novel To Kill a Mockingbird?

Racism plays a strong role in To Kill a Mockingbird by Harper Lee.
Tom Robinson, an African American male, is wrongly accused of raping Mayella Violet Ewell. In the novel, Mayella makes romantic advances towards Tom. When Robert Ewell, Mayella's father, witnesses these advances, he beats Mayella. He then accuses Tom of raping and beating her. Since racism plays a large role in their hometown of Maycomb, Robert Ewell knows that people will believe that Tom Robinson is guilty, despite not having any evidence. Mayella Ewell, despite knowing that Tom is innocent, says "That nigger yonder took advantage of me..." (167, Lee), using racism to her advantage.
Atticus Finch, a Maycomb lawyer, takes on Tom Robinson's case. Finch sets out to prove that Robinson is innocent. During the trial, people in Maycomb turn their backs on Finch and his family because he is representing an African American male, which is frowned upon for a white citizen. Despite clearly proving Tom's innocence in the trial, Finch loses simply because Robinson is African American. Even after the trial, Atticus and his family are looked down upon.
Scout, Atticus's daughter, observes how people treat her dad and the rest of her family during and after the trial. In chapter 11 of To Kill a Mockingbird, Scout asks her father, "Atticus...what exactly is a nigger-lover?" (144, Lee)
After Atticus asks her if anyone had called her that, Scout goes on to say, "No sir, Mrs. Dubose calls you that. She warms up every afternoon calling you that. Francis called me that last Christmas, that's where I first heard it" (144, Lee).
The town of Maycomb is stuck in a time when racism plays a prevalent role in society. Tom Robinson is wrongly accused of rape because of racism. Mayella and Robert Ewell wrongly accuse a man of a crime he didn't commit because of racism. Atticus Finch's reputation is tainted because of racism. Scout Finch experiences her family being treated poorly due to racism. Unfortunately, racism affects many events that happen in To Kill a Mockingbird.