I think social distance was better than physical distance because social distance to me suggest static clustering.

It's not a bit deal for you to be physically close to people as long as it's very few people and that cluster doesn't intermingle with other clusters. A household is a good example of a physically close cluster that can be socially distance from other clusters.

The key thing is to try to prevent contamination from cluster to cluster.

Also, "social distance warrior" is a more amusing way to describe those people on social media that can't stop posting about social distancing.