Self-proclaimed Hindus ought to have a position on the centrality of class and caste. While Hinduism is known for its tremendous diversity, for "Hindu" to be useful category, there has to be some religious claims and teachings that are agreed upon by all who proclaim to be Hindus.
The system of varna insisted that the law of social life should not be cold and cruel competition, but harmony and co-operation. Society should not be a field of rivalry among individuals.
Contrary to the wide academic conflation of caste and Hinduism, the practice of caste-based discrimination is in contradiction to the Hindu teaching that each individual is equally divine and has the potential to realize God based on his effort.