Because he justified himself rather than God. — See Job 19:6. Job maintained his innocence, and could not understand how his affliction could be reconciled with the justice of God. Yet, at the same time, he declared that God was his salvation (Job 13:16), and that it was impossible for man to be absolutely just with God (Job 9:2; Job 9:28), though at the same time he might hope in His righteousness (Job 23:3 seqq.).
Related Commentaries of Job 32:2
Job 32:2
2 Then was kindled the wrath of Elihu the son of Barachel the Buzite, of the kindred of Ram: against Job was his wrath kindled, because he justified himselfa rather than God.