He feels sad and moody for disobeying Atticus
Okay but what does that have anything to do with a question?
How does visiting the tree affect the narrator?
A.
The narrator is angry that there are not more real trees in their city.
B.
The narrator is excited by the chance to see the tree again in the future.
C.
The narrator is moved by the tree, and upset after learning it will be cut down.
D.
The narrator ignores their parents when he or she sees that they do not care about the tree.
THE ANSWER IS B
You may be hearing a biased or hindered perception of the story.
I think this partially answers your question??