Straight black drinkers are antisocial
Everyone’s coffee order is different. One way is to just take it black. For many people, this isn’t an appealing option because it offers too bitter a taste. But there are also a lot of people who can only drink their coffee this way, and it’s been reported that those people tend to be more antisocial, narcissistic, and even psychopathic. A 2015 study (“Individual differences in bitter taste preferences are associated with antisocial personality traits” by Sagioglou C. & Greitemeyer T.) confirmed the hypothesis that people who prefer bitter tastes “are associated with traits related to the darker side of personality.” You might not be a knife-wielding psycho if you like your coffee black, but you may not be the most cheerful, gregarious person either.
Espresso drinkers are well-traveled
Now, if black coffee is bitter, espresso hugely multiplies that taste. Just one little shot of espresso can be very bitter and very intense. Likewise, the person who drinks it can also have a rather intense or bold personality. If your coffee order is espresso, it can mean that you want to associate yourself with a particular social class or even that you’re pretentious. There are a myriad articles that discuss the attractiveness and the sophistication of espresso and even offer a guide on how to drink it the proper way. People often link espresso with being well-traveled or having a more refined palate.