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My Brijbhasi friend Krishna Balarama Swami preaches that for one to be a guru they must be born in a brahmana family. Brahmana and Vaishnava largely refutes that.
For Krishna Balarama Swami’s position – Guru Nirnaya Dipika
For point for point refutation – The Sarasvata Parampara and The Caste Brahmana Guru by B.V. Giri Maharaja