https://www.scmp.com/sport/china/article/3157775/table-tennis-chiefs-promise-action-after-spectator-chants-yellow-banana
Chinese fans and state media reacted to a member of the crowd at the George R Brown Convention Center in Houston, Texas, repeatedly chanting “yellow banana, yellow!” during sixth seed Liang’s thrilling 4-3 victory over Liam Pitchford.

だそうだが、SCMP自体がアレなんで
正確かどうかは不明