Examples of prejudice and judgement
Boo is judged by Scout, Jem, and Dill. They judged him for his family history, as the Radleys were generally shunned and/or feared by the children of Maycomb for rumors about how Boo ate cats, stabbed his dad with scissors, among other things.
Miss Caroline judged Scout when she told her that Walter wouldn't take the quarter, since she was new to the town. She also judged Scout when she read before she was supposed to be able to read.
Scout judged Walter Cunningham when he put syrup on his food. She didn't understand why he did it, and since she was a child whose sense of empathy was rudimentary at best, she ridiculed him for it.
The kids judged Boo, but this time less directly. Scout found gum in a knothole of one of the Radley's trees and Jem told her to spit it out because he thought the Radleys poisoned everything in/on their trees.
Boo is judged by Scout, Jem, and Dill. They played a game about him, assuming what he was like based on rumors spread around the town.
The kids judged the Radleys when they snuck out at night to peek inside the house, expecting to see something bad or scary. Mr. Radley also judged them by assuming they were black and deciding the best course of action would be to shoot at them.
The kids judge Mr Radley by assuming that he's filling the knothole just to upset them and put and end to the knothole gifts. They assumed based on what little they saw of him that he was acting out of malice.
Scout and Jem judged Mr. Avery by making a rather unflattering snowman. They know him as a grumpy old man, so they make a snowman in that image.
Cecil Jacobs, one of Scout's classmates, judged Atticus for defending a black man. Racism was commonplace back then, so someone choosing to defend a black man was unheard of. Francis did so as well, but also judged Dill for being short, calling him a runt. Also, Alexandra judges Scout for not being feminine enough, saying she aught to wear dresses rather than pants.
Scout judged Atticus by assuming that, because he's older than other kids' dads and doesn't do exciting things like hunting, that he's less exciting person than the other dads. Also, Atticus judges himself, thinking that he won't be able to shoot a rabid dog because he hadn't shot anything in a long time.
Jem judged Mrs Dubose by assuming she knew better when she insulted Atticus, leading to him destroying her flowers. Mrs Dubose also judged Atticus for, as previously stated, defending a black man. To her, as an older, crazier woman, it was even more unheard of that a white man would defend a black man.
Jem judges Scout, saying that she should stop bothering him and should start acting more feminine. The siblings then judge the members of First Purchase for not being able to read, as reading is a very basic skill to them. Also, Lula judges Calpurnia by criticizing her for bringing white kids into their black church, since First Purchase was meant to be a sanctuary to them and she didn't want the people who oppressed her to share it with her.
Aunt Alexandra judges Scout for not being feminine enough again. Scout is quite a tomboy, which is unheard of in those times. Alexandra also judges her for not having enough pride in her heritage.
Aunt Alexandra judges Calpurnia by believing that she is a bad influence on Scout, and says that she's not needed around the house anymore. Also, Dill judges his parents by assuming they don't want him around because they're not giving him attention, so he runs away.
Alexandra judges Atticus for defending a black man, ridiculing him for it and almost saying that he was disgracing the family. Also, Scout judged the entire situation with Atticus at the jail by assuming that Mr. Cunningham was just ignoring her friendly conversation, and thinking that she'd somehow messed something up.
The townspeople judge Tom by deciding to watch his trial like it's a performance. They want to see Atticus try to defend him, and they likely know he'll fail to defend him.
Jem judged the people in the trial by assuming that the defense will win halfway through the trial. He says "we've got him," showing that he's too naive to understand peoples' racial prejudices. Also, Bob judged the atmosphere of the trial by refusing to take things seriously, and Heck Tate judged the situation with Mayella by assuming she didn't need a doctor.
Mayella judges the people of the court by calling them cowards if they didn't convict Tom. This seemed like a guilt tripping tactic she used to get her way, whether she was doing it purposefully or not. Atticus also judged her by assuming that she'd have friends, even though she lives in isolation, making her feel bad.
Mr Gilmer judged Tom by assuming that because he's black he had some sort of ulterior motive when he helped Mayella with her work, since he believes a black man could never do anything out of goodness. He also judged Tom when he said he felt bad for Mayella, as he was supposedly a lesser person than her and the fact that he pitied her implied he felt he was a greater person than her, when he merely knew she deserved better than she got.
People judged Dolphus Raymond when he hung out with black people rather than whites since blacks were thought to be inhuman, so he pretended to be a drunkard so he'd be seen as the lesser of two evils.
The Jury judges Tom by saying he's guilty. The evidence clearly showed he was not guilty and it's heavily implied he was ruled guilty for racial reasons.
Jem judges the town by assuming that none of them saw anything wrong with prosecuting Tom for a crime he didn't commit because of his race.
Aunt Alexandra judges Walter Cunningham for being poor, calling him trash and saying he can't come visit Scout for dinner for that reason. Also, Atticus judges Bob, assuming that he's only making empty threats and not worrying about him.
Miss Maudie's missionary circle judges the residents of Maycomb by assuming that they're among the only ones that think the trial was unfair. Jem did the same thing in chapter 22.
Scout judges a pillbug by deciding to kill it, even though it was just minding its own business. This is likely a metaphor for Tom and the people of Maycomb.
Miss Gates, Scout's 3rd grade teacher, judges Tom. After the trial she said that it was about time that blacks were taught a lesson, and said things about how they were getting to be above themselves. Meanwhile she talks about how unfair it is that the jews are being persecuted, showing her hypocritical beliefs.
Bob Ewell judges Atticus by assuming that he was the reason he lost his job. He thought that gaining infamy from the trial was what costed him the job, but in reality it was his laziness.
Atticus judged Bob Ewell by assuming that his threats were empty. Although this happened multiple times in previous chapters, the effects only arose in chapter 29 when he attacked Jem and Scout.
Atticus judges Heck Tate by assuming that the reason he's saying Bob accidentally stabbed himself was to protect Jem, when it was to protect Boo from the prying eyes of the townspeople.