Delivering a lecture at the India International Centre here, he also said there was a need to assess the impact of "studied subduing" or erasing of diversity in school curricula, text books on history and culture, and funding patterns of cultural institutions and academies.
"There is a difference between promotion of diversity, and its recognition. Diversity in our land are a ground reality, are reflective of our society's historical experience, and are traced in all periods. The exist at the core as also on the periphery and have their own unique characteristics and cannot be homogenised," Ansari said.
"So, to deny the existing reality of cultural diversity and the resultant composite culture, and to replace it with any form of monoculture in the name of a new, strident, illiberal, nationalism, is to conduct a form of regressive regimentation," he said.
Ansari, who held office from 2007-2017 , in his nearly 25-minute speech, also made a reference to the philosophy of a nation espoused by RSS ideologue M S Golwalkar.
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"It is argued that beneath the diversity is a unity, and this unity emanates from a single mainstream premised on a conflation of land, religion, and culture, and that deviations form it must be subsumed in a hegemonic wave demanding national unity.
Ansari, who has previously served as the vice-chancellor of the Aligarh Muslim University (AMU), also emphasised that the distinction between "Indic and non-Indic matters" in academic and popular writings should be contested, since it is not sustainable scientifically and its principal purpose in societal matters is to "deny and denigrate".
Ansari also said, "We need to assess the impact of studied subduing or erasing of diversity in school curricula, text books on history and culture, funding patterns of cultural institutions and academies, projection of soft power abroad through government and cultural agencies."
Later, he fielded some questions from the audience on a range of topical issues, connected with the theme of his lecture "Our Culture: Composite and Unique" but offered subtle answers, without naming any entity.