1. Athletic Rivalry: Maniac is a naturally talented athlete who excels in various sports effortlessly. John McNab, who prides himself on being the neighborhood's top athlete, feels threatened by Maniac's skills. He sees Maniac as a rival who challenges his athletic supremacy.
2. Popularity and Acceptance: Maniac's friendly nature and ability to connect with people from different backgrounds quickly gain him popularity and acceptance in the neighborhood. John McNab resents the attention and admiration Maniac receives, as he feels his own position as the neighborhood's "tough guy" is being undermined.
3. Breaking Social Norms: Maniac's unconventional lifestyle and willingness to challenge societal norms further irks John McNab. He dislikes Maniac's non-conformist attitude, which goes against the traditional roles assigned to children in their community.
4. Friendship with Amanda Beale: John McNab harbors romantic feelings for Amanda Beale, a girl in their neighborhood. However, Amanda seems drawn to Maniac's kindness and accepting nature. McNab feels jealous and angry at Maniac for this connection.
5. Challenging Assumptions: Maniac's ability to build bridges and friendships within the racially divided town challenges the assumptions and prejudices held by many residents, including John McNab. McNab represents the old, segregated way of thinking, and Maniac's actions threaten to disrupt that norm.
In essence, John McNab's anger towards Maniac stems from his jealousy, need for dominance, and resistance to change. He fears that Maniac's presence and impact on the community will diminish his own significance and status.