1. Mrs. Greeder assumed that Jin was from China. She also disrespected him by subtly making fun of his name. Mrs. Greeder and Timmy both assumed Jin ate dogs, which is a common stereotype directed at Asians. Many students thought Suzy and Jin were related because they were both asian, and when they found out they weren't, they started rumors saying they were in an arranged marriage.
2. She could have had him introduce himself instead of assuming things about him.
3. He could have said "What are you eating?" and not made the dog comment.
4. The kid who said "Be cool man." could have said. "Don't say things like that."