Roker said Friday on NBC's "Today" show that his tweet a day earlier was "below the line."
Roker said he understands that some kids depend on school meals, and that working parents have trouble arranging backup child care. But he says other cities face the same issues and still close their schools.
He said it's also a challenge for a working parent to scramble to get children to a school that stays open and then may have to close early.
De Blasio said Thursday that keeping the schools open was the right decision.