The golden rule of sidewalk is walk on the right, and don't take up the sidewalk with 2, 3 or 4 people (except if you shift when someone approaches from the other direction).

A good rule. A civil rule of order and reciprocity. A rule sometimes broken regardless of sex, socio-economic status, race, ethnicity or religion). And when I, an older white male, encounter others who do not follow the good rule (regardless of sex, socio-economic status, race, ethnity or religion), I rest comfortably in the knowledge that as an former offensive lineman in football I will enforce the rule with my shoulder - and not say sorry. However, I am fair and equitable in my collisions. Sorry is saved for those times when someone inadvertently bumps you or steps on your foot.