Classifying burnout as a dismissive term is a problem in and of itself. It's a real thing, but I also understand that people who have never experienced it can have a hard time taking it seriously and would be tempted to dismiss it. To be honest, I was one of them, until it happened to me a few years ago. It took me 5 months to recover and be able to go back to work. Since then, everybody in those shoes gets my support.