"Mockers and scoffers" is not a blanket prohibition on criticizing false prophecy. God himself mocks false prophets (Ps. 2), and Elijah mocked the prophets of Baal. Mocking and scoffing are condemned when directed at truth, not when directed at false claims made in God's name. Calling critics of date-setting "scoffers" is a manipulative rhetorical move that shields false prophecy from accountability.