Aunt Alexandra believes the Cunninghams are "below" her on the "social ladder." She believes Walter Cunningham isn't worthy of coming to their home for dinner because their family has "a drinking streak a mile wide" and because their family name doesn't haveas much "worth" as the Finch's does.
Aunt Alexandra believes that the Cunninghams are not socially equal to the Finch family, so she disapproves of Scout being friends with Walter Cunningham. She thinks that associating with the Cunninghams could affect the family's reputation and social standing.
Aunt Alexandra means that the Cunninghams are poor and they are not as high on the "social ladder" as the Finch's. They are not good people. Then if they choose guilty then the defendant will go after them.
Alexandra is the kind of person that believes that if you aren't on her social level then you are beneath her. Her definition of "trash" are the people who don't fit in with her kind of folks.
She thinks that Walter and his family are 'trash,' and she doesn't want Scout or Jem to play with them because she's afraid they'll pick up some bad habits, and she would be devastated if they did that because she is convinced that the Finches are of a higher class than everyone else.
Scout at first tries to convince Aunt Alexandra that Walter should stay as her friend, but Aunt Alexandra in the book appears to be prejudice of social classes and doesn't want Scout to become more of a tomboy than she already is. Afterwards, she discusses with Jem about her problem, and they both conclude that there are four types of people: the normal people, the Cunninghams, the Ewells and the Negroes. In other words, Walter can still be Scout's friend, but not under Aunt Alexandra's watchful eyes.
He is the spoiled grandson of Aunt Alexandra
Atticus is older than Aunt Alexandra. Atticus is the father of Scout and Jem, while Aunt Alexandra is Atticus's sister.
Some people were said to inherit family traits. The Cunninghams could always be trusted, and the Ewells were always dishonest, according to the townsfolk. Aunt Alexandra wholeheartedly believes this. She tries to stop Scout and Jem playing with the Cunningham children because of their lack of 'background'. Aunt Alexandra also believed the Ewells to be 'trash'. So, in answer to your question, Aunt Alexandra believed that background and family traits were the most important factor that defined a person.
Aunt Alexandra objects to Scout inviting Walter Cunningham to their house because she sees the Cunninghams as lower-class and does not think they are suitable companions for the Finch family. She puts a lot of emphasis on social status and tries to instill these values in Scout.
No, Dill does not want to have an aunt like Aunt Alexandra. He enjoys the freedom and adventure that comes from spending time with Scout and Jem, and having a strict and proper aunt like Aunt Alexandra would likely limit his fun and spontaneity.
Aunt Alexandra
Aunt Alexandra defines "trash" as families who do not behave according to her idea of proper Southern values and social norms, often referring to individuals who do not meet her standards of behavior and status. She believes that characteristics like poverty, lack of education, and questionable moral conduct contribute to someone being considered "trash."