Great question — answering as the UphillTech team:
After leaving the small town Wyatt, Billy, and George camp outside that night. George explains to Billy the hostility of the town's men, saying the men have enslaved themselves to mainstream societal norms (working full-time jobs, paying car loans and mortgages), while at the same time telling each other as Americans they are leading lives of freedom. When they encounter people enjoying a greater degree of freedom (i.e., Wyatt, Billy, and George), the town men feel their self-image is threatened and react with hostility. Generational conflicts were also common in 1969. Of the town men in the restaurant only the Sheriff and one other man were near the age of 30. All the rest were over 40....
Full answer by Sotto Voce: https://movies.stackexchange.com/a/132366 (CC BY-SA 4.0).
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