“有白男在旁边说他讨厌用筷子“

Was your daughter using chopsticks at that moment? If so, he was showing his contempt toward her; it's not about the chopsticks.

People behave in certain way because who they are, not because who you are. They were telling her what was on their mind at that moment. Pretty dumb.

Treat it as information.

Do not seek reflections of your self in/from others. Validate your self.