Prig

In British English, a prig (/ˈprɪɡ/) is a person who shows an inordinately zealous approach to matters of form and propriety—especially where the prig has the ability to show superior knowledge to those who do not know the protocol in question. They see little need to consider the feelings or intentions of others, relying instead on established order and rigid rules to resolve all questions.

The prig approaches social interactions with a strong sense of self-righteousness.