"Tempting a Negro"
Actually, Atticus doesnt mock Mayella. Mayella thinks Atticus is mocking her because he is caller her Ma'am and Miss Mayella, which she isnt used to.
Atticus says he only has one witness left to call after Mayella Ewell has finished testifying. This witness turns out to be Tom Robinson, whose testimony is crucial for the trial.
Atticus says he has pity on Mr. Ewell's daughter, Mayella, because he sees her as a victim of her father's abuse and her harsh living conditions. He empathizes with her difficult situation and recognizes the lack of love and care in her life. Atticus believes that Mayella's actions are driven by fear and loneliness rather than malice.
The judge asks Mayella what she's scared of, and she points to Atticus
Mayella cries because she thinks Atticus will find out that her father really did it.
Mayella was afraid of Atticus in the courtroom because he was treating her with respect and she had never been treated like that before. She was also afraid of Atticus because he might ask her questions and she might give him answers that could lead him to the truth and then her father would do horrible things to her.
Bob Ewell, who is Mayella's father, beat her up
Mayella's reaction to Atticus' behavior in court is ironic because Atticus is the only person actually trying to defend her and seek justice for her, yet she is hostile towards him. Despite his efforts to help her, Mayella feels threatened by Atticus' questioning and sees him as an enemy due to her prejudiced views.
Bob Ewell or Mayella
Atticus says that the only think that Mayella had done wrong, was to tempt a black man "and not an uncle but a young, strong black man," and her father had seen it. Now she is trying to erase the crime that she has done with another, by claiming that an innocent man had sexually assaulted her.
Atticus aims to show that Mayella is not a reliable witness by poking holes in her story and highlighting inconsistencies. He tries to establish that Mayella's accusations against Tom Robinson are a result of her own personal issues and not based on factual events. Atticus demonstrates that her testimony lacks credibility, bringing into question the integrity of the case against Tom.
When Mayella is on the stand the question Atticus asks that makes her furious is "How?" She has just described how Tom Robinson choked and beat her, and Atticus asks Tom to stand up. This draws the jury's attention to the fact that Tom's left arm is useless, making it highly unlikely he was Mayella's attacker. When Tom stands, Atticus asks Mayella if Tom is the man who attacked. When she responds that he is, Atticus asks, "How?"