Outgoing Mayor Eric Adams schooled his successor Zohran Mamdani over the democratic socialist’s rent freeze proposal — saying they can actually make the city less affordable for working class residents.

“The lack of understanding that idealism collides with realism when you have to govern a city and provide for working-class people. These are real issues,” Adams said in an interview that aired Sunday on WABC 770 AM’s “Cats Roundtable.”

Adams criticized Mamdani’s hope for a rent-freeze for the city’s rent-controlled apartments — saying the mayor-elect should consider that building owners have to increase their incomes to meet increasing costs one way or another.

“Who’s going to pay the increases in taxes? Who’s going to pay the increases in repairs? Who’s going to pay for the increases i

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