What does the sociologist Richard Sennett mean when he says that modernity has seen the "fall of public man"?

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Richard Sennett argues that modernity has seen the decline of public spaces where strangers come together and engage in meaningful interactions, resulting in the rise of private life and the prioritization of intimate associations such as immediate family. This is what he calls the "fall of public man."

What Does the Sociologist Richard Sennett Mean When He Says