Self-righteousness (also called sanctimoniousness, sententiousness, and holier-than-thou attitudes) is a feeling or display of (usually smug) moral superiorityDictionary.com definition derived from a sense that one's beliefs, actions, or affiliations are of greater virtue than those of the average person.

Self-righteousness
Self-Righteousness
Self-Righteousness
Self-righteous rage and the attribution of blame.
A Short Scale to Measure Self-Righteousness
Self-righteousness: Cognitive, power, and religious characteristics
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Our self-righteous civil society
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Some comments on the narcissistic aspects of self-righteousness: defensive and structural considerations
Adult locus of control and self-righteous attitudes.