In this assembly of people, believers are pictured as sheep, while unbelievers are depicted as goats. The problem for the postrib view is that if the rapture occurs as Jesus is descending to earth at His second coming, as posttrib proponents believe, that means all the sheep will caught up to meet Him in the air, leaving no sheep on earth for this judgment.
This is a WILD misunderstanding of the historical premillennial rapture. They have forgotten what John Piper said earlier and are setting up their own strawman