The checklist
The idea that everyone in the party is quietly evaluating you and making up a story in their head
The forced body language
The weird conversation starters
Like all this stuff is forced and artificial and the goal is you're trying to build a relationship with someone for the implicit purpose of getting something out of them. None of this is genuine social connection, it's just a performance to try and increase your own status.
All just superficial interactions to keep up the social standing, presenting yourself as special and useful to associate with while not actually making any meaningful connection with anyone. That's the feeling I got from reading that scene as well as whenever I hear about this networking stuff.