Contradiction with Psalms 146:3
Psalms 80:17 speaks of the son of man as a point of focus or confidence, whereas Psalms 146:3 advises against putting trust in princes or the son of man, highlighting the futility.
Psalms 146:3: Put not your trust in princes, [nor] in the son of man, in whom [there is] no help. [help: or, salvation]
Contradiction with Jeremiah 17:5
While Psalms 80:17 elevates the status of the son of man, Jeremiah 17:5 suggests that trusting in man diverts one from God and brings a curse.
Jeremiah 17:5: Thus saith the LORD; Cursed [be] the man that trusteth in man, and maketh flesh his arm, and whose heart departeth from the LORD.
Contradiction with Isaiah 2:22
Psalms 80:17 suggests divine elevation of the son of man, but Isaiah 2:22 recommends ceasing from relying on man, questioning their worth.
Isaiah 2:22: Cease ye from man, whose breath [is] in his nostrils: for wherein is he to be accounted of?