Ummmm it’s got more water in it???
I think Marcus used Identity Moratorium when he tried telling these men that he and his friends were just High School students, and then he tried telling the men that his friend was injured. Marcus tried several options to get a reaction out of the men without success. I'm not sure if this will help, honey, but I did my best.
"The great Gatsby" contains many symbols open to the interpretation of those who are reading the book and relating them to the themes presented in the story. One of these symbols is Dr. Eckleberg’s eyes, which are painted on a billboard facing the Valley of the Ashes (a dangerous, demoralized, ugly place resulting from the greed of the rich).
These eyes can represent the eyes of God, judging the greed, pride and dehumanization of American society that is always in search of wealth and goods, even if it implies the destruction of other people and the sadness of many.
This meaning is related to the "American dream" that is portrayed as one of the themes of this book. Thus, the billboard sends the message of how the American dream can be empty and disadvantageous in some situations.