I came up with the term myself which is why you can't find it but I also half expected someone to have named it as well. Because "manners" or "nice" is a mostly culturally-loaded or very subjective term I wanted to say "be considerate to others above how even one would want to be treated." And it's a word not used daily except among the religious in the West, and that works well for those groups because "act how you would in church / template / mosque / synagogue" as a reminder of what civility can look like. Granted, some churches in the US are truly frightening to me and maybe I should refrain from calling on such emotions.