The social structure employed by the Hindus but rejected by the Buddhists is the caste system.
Explanation:
There are several things that define India and that are unique to its society, and one of those trademarks is the caste system. This system is a social structure that has been practiced for thousands of year. The caste system has been implemented by the Hindus, and has been essential part of the Hindu society.
The Buddhist, on the other hand, became majority in India in one period, and the caste system was rejected by them, as it was a system that was discriminatory and restrictive, especially toward the members of the lower castes, and that was not what the Buddhism encourages. That didn't lasted long though, and once the Hindus became majority again, the caste system again became part of the whole subcontinent. It was only recently that the caste system has been outlawed and made illegal, as it was seen as a social structure that harms the society and its progress.
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