Sure, I wasn't trying to make any point about your comment. I just thought it was a really fascinating example of how language spreads and evolves,slowly at first then all at once. Please excuse the musing haha
You point is interesting how speech patterns catch on and become the phrase 'du jour'. I think the internet has changed that dynamic, it used to be only withing people you saw face to face. Now we're exposed to a much wider range of people and styles.
Anyhow, I haven't seen the trend of calling out an entity as being a LARPer. But I have to admit, it's kind of funny. It does make me giggle :)