It’s a bit selfish, but if I take the time to show up early and get a seat I am not going to make myself uncomfortable because you feel entitled. I’ll move a bit if there’s room, but if half the seating area further away is open then you can sit your late ass down there.
Squeeze together? “Oh you came late? No those three seats are my personal space I want untouched. If you arrived at the same time as I did I would have done the same but not mentioned it on the Internet”