Working as a barista, you get to meet a bucketload of the general population, most of whom are wildly entitled, despite the fact that underneath their short blond haircut and agitated pointing finger, they're just like you: a human being. Unfortunately, customers were either brought up without manners and never managed to get a knack for them, or they were brought up with manners, and chucked them out the second they turned 18. In any case, OP was working as a barista at a cafe, when a Karen re…