Final answer:
The question appears to pertain to a specific event from a story that is not provided in the given texts. Therefore, it is not possible to accurately answer who the kids were mostly nice to, except for one, on Annie's first day of school.
Step-by-step explanation:
The student's question asks about a specific detail from Annie's first day at school. Annie told her mom that the kids at school were mostly nice, except for one unspecified person. This detail seems to be missing from the provided texts, as none of them explicitly mention Annie's first day at school or the person who was not nice to her.
Therefore, without additional context or information from the story or passage that the student is referencing, it is not possible to provide a factually accurate answer to this particular question.