"Nothing's okay, so it's okay" was the major turning point for Brad Stand and the existential detectives working on his case. Which in reality makes perfect sense, since life is chaotic and hectic, wouldn't it be perfectly normal for nothing to be "okay"? Since "okay" really isn't a state of being you really can't "be" "okay". However you sure can think that you are. Existentialism is the philosophy behind "being" and it can be interpreted in many different ways.
In the beginning of the film the ideas of existentialism between the Jaffe's and Caterine Vauban took on almost a "Star Wars" mentality. The force represents existentialism itself, it has ideas and they can be used and manipulated in any way which the user sees fit. Vivian and Bernard Jaffe represent the Jedi, and the lighter and more "flowers and bunnies" side of the force. Caterine Vauban is Darth Vader, take over and not care about the interconnection of anything.
As the cinematic adventure went along however, it was revealed that the two sides of the story were not good and bad, but just two pieces to the puzzle. Albert Markovski realized this in the movie when he lit Brad's jet skis on fire. The picture that was taken by Vauban made Albert realize that he and Brad were interconnected, they both suffered pain and "human drama" throughout the course of the story, he finally sees the Jaffe's point of view.
Coincidentally, Albert realizes that the only thing that connects us is nothing, thanks to Caterine Vauban. Our consciousness is what binds us together and there is no way to escape from that for good, unless you are dead, and that would kind of defeat the purpose. The big red ball is an escape from this consciousness, but as I said previously, that escape cannot be permanent. Since everything is related by nothing, and nothing is okay, then okay could be a state of being. But thinking that you are something, and really truly living that same thing are two...