Final answer:
The other boys disapprove of Stanley's and Zero's arrangement because they view Zero as being beneath them socially. While the disapproval is not fair to both boys, it is particularly unfair to Zero. Fairness would require the boys to set aside their biases and treat Stanley and Zero as equals, acknowledging their friendship.
Step-by-step explanation:
The other boys disapprove of Stanley's and Zero's arrangement because they view Zero as being beneath them socially. They see Stanley as aligning himself with someone of lower status, and this goes against the social hierarchy that is established within the group. The boys' disapproval stems from their own prejudices and desire to maintain their perceived superiority.
While the disapproval is not fair to both boys, it is particularly unfair to Zero. Zero is a valuable and deserving friend to Stanley, and his worth should not be judged based on societal expectations. Fairness would require the boys to set aside their biases and treat Stanley and Zero as equals, acknowledging their friendship.