They resented Hazel Bryan because they thought her attitude was exaggerated and that it humiliated white people. Hazel Bryan didn't deserve this resentment, as she was acting on the thoughts they stimulated.
We can arrive at this answer because:
However, these families were the ones that stimulated the feeling of racism and prejudice against black people. These feelings are what stimulated Bryan to act the way she did, as she was very young and prone to believe in racist concepts.
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