Chidi: Quick summary of contractualism. Uh, imagine a group of reasonable people are coming up with the rules for a new society.
Eleanor: Like if your Uber driver talks to you, the ride should be free?
Chidi: Sure, but anyone can veto any rule that they think is unfair. So if you said, "We should be able to break our promises without any repercussions," someone would veto that rule.
Eleanor: Well, my first rule would be that no one can veto my rules.
Chidi: Well, that's called tyranny. And it's generally frowned upon. If you make a promise to someone, you should do it. Just like I promised to help you and still am, despite your constant mockery.
Eleanor: [mockingly] "Despite your constant mockery." Whatever, you love it.