How Cassandra Became Karen

Karen is the angry, maybe middle aged, typically white female who rages in public at the slightest inconvenience. If her McDonald's order, she ordered a large fries, but she was she opened her bag when she got in her car and it's a small fry. She becomes enraged and storms back into the McDonald's and just demands to see the manager. That's a Karen. I mean, she's expressing angry emotions.