Virtue-signalling (VS) is feeling morally superior, by virtue signalling, that one is holier-than-thou. But is it a sin?

VS synonyms are:
• judgmental
• moralistic
• pearl-clutching
• preachy
• priggish
• sanctimonious
• self-righteous
WBG: Do a WBG on this proposition:
Virtue-signalling (VS) is feeling morally superior, by virtue signalling, that one is holier-than-thou. But is it a sin?