What does its a great advantage not to drink among hard drinking people mean off gatsby?

This line from "The Great Gatsby" suggests that refraining from excessive drinking sets one apart from a group of heavy drinkers, implying a sense of superiority and control. It highlights the idea that abstinence can be a strength in a society where heavy drinking is the norm, showcasing a form of self-discipline and moral superiority. This attitude aligns with Jay Gatsby's belief in maintaining a facade of respectability and self-restraint despite the excesses of the Jazz Age.