Its fairly common to see cookers derided as “larpers”. Now the FBI has a formal guide on how to tell the difference between larpers and violent extremists:
https://leb.fbi.gov/articles/featured-articles/larping-and-violent-extremism
I’m not sure its right on “audience” (it thinks larps want one while violent people who later claim to be larpers really, really don’t). In Aotearoa, we’ve generally found an audience off-putting for the participants, as well as them missing a lot of what is going on. OTOH, our usual response when asked “can I watch” is “the best way to experience larp is by participating; would you like to play?”