I am technically in the preboard group

The inbound flight from Dublin was late, and by the time the boarding had started, it was the usual boarding chaos; everyone was boarding at the same time...lol. By the time I finally got on board (I chose to board toward the tail end of boarding), some guy was playing music chair; he had at least a dozen people in his group, asking multiple pax not in his group to switch seats; 2 of them sat next to me in E+ (middle and aisle). F full; no upgrades to 752 lie-flat.