Well, not a grievous insult.
Here's what I'm saying:
Being a fan of roleplaying games is one thing. Thats all of us. This type of person participates in roleplaying fandom (like these online hangouts) because he games. Thats a fan. Often this itself is derogatory. The crime of honestly liking something enough to follow the developments and enjoy it used to be the height of gauche behavior. FAAANBOYSSS!!!!!
Heh. I am pretty much one of those guys. I'm as gauche as they come.
Being involved only with of a certain specific kind of roleplaying games because buying in and pledging allegiance gives you a special sense of belonging to an exclusive "movement" is like.. an entirely different thing. This person is involved in gaming as an excuse to be involved in the online communities. That's a fad consumer. Fad consumers always think they are cooler than fans (or "fanboys").
But the wonderful irony is, every year, fad consumers have to wonder what the fuck they are doing stil hanging about in a hobby they no longer truly enjoy. This usually happens approximately 3-4 days after every convention. The pattern every year is 1) glowing convention report, 2)then... silence, 3) sudden despair, self-examination, and self-loathing.
It's been going on for a few years, and I always get a kick out of it!