I think Kaprow's main argument is that people (himself included) are guilty of going through everyday life without noticing the art within it, such as brushing your teeth. He references some work by Duchamp and relates that to his argument. I believe that he is talking about the irony in the difference between everyday life and turning ordinary things into artwork.
This reading relate to the theme of class, because it helps us think outside of the box. It takes an idea and takes it to another level. I think about how we are challenged to think of 10 different ways we can portray a specific action. Instead of going with your initial idea or thought, push yourself to think outside of the ordinary. I think this will help my art become more relatable to people because it is something that they do as well.