holier than thou
/ˈhoʊliər ðən ˈðaʊ/
adjective
- Having or showing an attitude of moral superiority; acting as if one is more virtuous or righteous than others.
- Her holier-than-thou attitude made it hard for her to make friends.
- I can't stand his holier-than-thou lectures about eating healthy.
- The politician's holier-than-thou speech about honesty was ironic given his recent scandal.