Contradiction with John 12:13
This verse speaks of people exalting with praise, which contrasts the shame mentioned in Psalms 132:18.
John 12:13: Took branches of palm trees, and went forth to meet him, and cried, Hosanna: Blessed [is] the King of Israel that cometh in the name of the Lord.
Contradiction with Matthew 5:39
This verse advocates turning the other cheek and not responding with shame or punishment to one's adversaries, which contradicts the theme of shame for enemies in Psalms 132:18.
Matthew 5:39: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Contradiction with Romans 12:14
This verse encourages blessing those who persecute you, which is in contrast to covering enemies in shame as Psalms 132:18 suggests.
Romans 12:14: Bless them which persecute you: bless, and curse not.
Contradiction with Luke 6:35
Instructs loving enemies and doing good to them, contradicting the desire for their shame depicted in Psalms 132:18.
Luke 6:35: But love ye your enemies, and do good, and lend, hoping for nothing again; and your reward shall be great, and ye shall be the children of the Highest: for he is kind unto the unthankful and [to] the evil.