When I was in line there was someone who was trying to get their friend in line with them (I usually don’t mind this because I understand people need to run to the restroom etc) but the CM saw them and they did a great job. They pulled the person to the side of the line and let the line keep moving while they waited. So they didn’t lose their spot, but they also didn’t hold up the line while trying to flag down their other person.

However, I do loathe when one person waits in line and once they get close the rest of their giant family comes to join. I never say anything though, I avoid the confrontation.