A woman was dubbed the "Mask Karen" when she was involved in an incident on a train in which she appears to have a public freakout. Her and another woman are harassing two men who were said to be "drinking coffee" and that was allegedly why they didn't have their mask on at the time. They start recording the men and then another woman gets involved and gives them trouble for what they're doing to the two guys. You can see the Dunkin cup on the tray, so it makes sense. At one point the conductor gets involved and says if they don't go back to their seats, that he'll call the cops and let them deal with it.
The one woman freaking out also brags that she has 70,000 Twitter followers, like anyone cares. This was posted by Ashley St. Clair on her Twitter account, where she has almost 400,000 followers. Follow the drama here.