"The inevitable corollary to self-righteousness is contempt for other people."

"The inevitable corollary to self-righteousness is contempt for other people."
~ author unknown, can't find source again

Self-righteousness (also called sanctimoniousness, sententiousness, and holier-than-thou attitudes) is a feeling or display of (usually smug) moral superiority derived from a sense that one's beliefs, actions, or affiliations are of greater virtue than those of the average person. Self-righteous individuals are often intolerant of the opinions and behaviors of others.
https://en.wikipedia.org/wiki/Self-righteousness