In the movie they just argue about random things and constantly switch sides. It reminds me a lot of the situation we see in No Exit between Garcin, Inez, and Estelle and their respective outlooks on life. Christoph Waltz's character, for example, represents a higher, and more educated social class, while Reilly's, who is a plumber guy, represents a lower class. There is also gender tension present in the movie. Here is a clip from the movie:
It is a little more exaggerated than No Exit but I feel it gets across the same point of "there is no point to this argument".