Adults and children treat Auggie differently because adults are more concerned with appearance, while children are more concerned with the fun and well-being that a person can provide.
Based on this, we can answer the other questions as follows:
Auggie is a boy who has Treacher Collins syndrome, a disease that affects the growth of the bones in his face. This makes Auggie look unusual, beyond any standard of beauty. This appearance makes him suffer prejudice from many people, who do not know that he is a good and kind boy.
More information about Auggie at the link:
https://brainly.com/question/7985403