Possible meanings are 1) Job is comparing his displeasure for his circumstances to people's dislike for bland food or 2) Job is comparing his displeasure for his friend's advice to people's dislike for bland food. (See: [[rc://en/ta/man/jit/figs-metaphor]])
Job uses these rhetorical questions to emphasize his own displeasure. These questions can be written as a statement. Alternate translation: "Tasteless food cannot be eaten without salt, just as there is no taste in the white of an egg." (See: [[rc://en/ta/man/jit/figs-rquestion]])