Answer
The theme of this story is bullying and its negative effects on both the victim and the bully.
The actions of Kyle towards Lucy, such as kicking her shoe, calling her names, and writing mean words on her homework, demonstrate his bullying behavior. Lucy's decision not to attend Kyle's party shows the impact of his actions on her, while Kyle's devastation at her absence suggests that he may have regretted his behavior towards her. Overall, the story highlights the harmful consequences of bullying and the importance of treating others with kindness and respect.