It's rude to call people disgusting.
Becker watches his student perform a scene poorly for an acting assignment.
Becker wants to critique his student.
After grading his student, Becker sends them an email with tips on how to improve their performance.
Becker notes that his performance made him ill and reminded him of moldy bread.
Becker's student applies the advice landing a leading role in the school play.
His student breaks down  crying.