I'm with you. For a start it's now in common usage as a proper noun for the person running the social media accounts of sports, and in particular football, teams.
Well it's not in my vocab.It's been in use as a standalone word for about 100 years and ubiquitous in the last 30-odd years. I'm quite sure those saying it isn't a real word use it in their day-to-day lives.
Well it's not in my vocab.