Vanity Fair (February 1920) 
Variant: There may be said to be two classes of people in the world; those who constantly divide the people of the world into two classes, and those who do not. 
Context: There may be said to be two classes of people in the world; those who constantly divide the people of the world into two classes, and those who do not. Both classes are extremely unpleasant to meet socially, leaving practically no one in the world whom one cares very much to know.
                                    
“Colin believed that the world contained exactly two kinds of people: Dumpers and Dumpees. A lot of people will claim to be both, but those people miss the point entirely: You are predisposed to either one fate or the other. Dumpers may not always be the heartbreakers, and the Dumpees may not always be the heartbroken. But everyone has a tendency.”
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                John Green
            
        
        
            
                
                    , 
                
                
                    book 
                
                
                
                    An Abundance of Katherines
                
            
        
        
    
    
        
        
        
            
            
        
        
        
        
        
        
            Colin Singleton, pp. 15-16 
An Abundance of Katherines (2006)
        
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                                        Vanity Fair (February 1920) 
Source: https://quoteinvestigator.com/2014/02/07/two-classes/
                                    
Source: How to Win Friends and Influence People (1936), p. 63
                                
                                
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