Are there countries where people do not try to get to their target location without bumping in someone?
I don't know about straight up not caring if you walk into people along the way but the average separation distance we like to keep will certainly vary by place and that may well vary when the switchovers will occur. Maybe 15 degrees in one place with larger spacing vs 10 degrees in a place where people tend to walk closer together.
Without trying to avoid bumping is not accurate but certainly there is more of it in South Korea than in places like the US.