Then its just exposing people who were already jerks for who they are. I use Venmo often, and the authors example just seems to speak badly of his friend circle:

Now, however, such transactions may be followed with a passive-aggressive charge the next day or even late the following week, sometimes over dollars and cents of differences in price. A friend recently requested $4 for the difference between a drink she bought me and a cheaper drink I bought her in return. Another friend charged me $10 for a cab when I had previously bought her a $12 drink, so I felt prompted to charge her back.