Final answer:
Jin Wang's thought about wanting to beat up Wei-Chen when he arrives at school shows his character has developed from empathy and acceptance to possible aggression and frustration. It suggests an internal conflict and a change in response to the social pressures of fitting in and self-identity issues.
Step-by-step explanation:
When Wei-Chen arrives at school and Jin Wang immediately thinks, "Something made me want to beat him up," it demonstrates significant changes in Jin Wang's character development since he started attending Mayflower Elementary. Initially, Jin Wang may have felt sympathy or could have been more accepting towards others, especially to someone also of Asian heritage like Wei-Chen; however, his thoughts now suggest an internal struggle and possibly a shift towards aggression and frustration. This change could reflect Jin Wang's response to the pressures of fitting in, or his desire to distance himself from his own heritage in an attempt to assimilate. It also points towards an inner conflict affected by the social environment and Jin's ongoing self-identity journey, which is common in the narratives of many protagonists who experience dramatic personal change throughout their stories.