Contradiction with Matthew 5:5
This verse emphasizes humility, while 2 Corinthians 12:11 involves Paul asserting his authority and defending his apostolic credentials, which seems contrary to being meek.
Matthew 5:5: Blessed [are] the meek: for they shall inherit the earth.
Contradiction with Proverbs 27:2
This verse advises letting others praise you and not praising yourself, whereas in 2 Corinthians 12:11, Paul speaks of his achievements and authority.
Proverbs 27:2: Let another man praise thee, and not thine own mouth; a stranger, and not thine own lips.
Contradiction with 1 Peter 5:5
This verse encourages submission and being clothed with humility, whereas in 2 Corinthians 12:11, Paul is compelled to "boast" about his authority.
1 Peter 5:5: Likewise, ye younger, submit yourselves unto the elder. Yea, all [of you] be subject one to another, and be clothed with humility: for God resisteth the proud, and giveth grace to the humble.
Contradiction with James 4:6
This verse says that God resists the proud but gives grace to the humble, while 2 Corinthians 12:11 shows Paul feeling forced to speak on his achievements, which can be seen as prideful.
James 4:6: But he giveth more grace. Wherefore he saith, God resisteth the proud, but giveth grace unto the humble.
Contradiction with Philippians 2:3
This verse encourages doing nothing out of selfish ambition or vain conceit, yet in 2 Corinthians 12:11, Paul mentions having to "boast" to assert his position.
Philippians 2:3: [Let] nothing [be done] through strife or vainglory; but in lowliness of mind let each esteem other better than themselves.