At least generally speaking, cults don't tolerate all the different factions and splits of dogma (what that mean, shipping drama, etc), and cult leaders also tell people how to live whereas we'd laugh (best case scenario) at each other and the mods if they tried to tell us how to live our personal lives (who we could date, how we'd deal with our families, etc). We don't even actively recruit. Or even send money for the board the same way we would to say Netflix.
And think how much crap we give many involved in the making of our shows, including Joss Whedon. That would never be allowed in a cult, not even talking behind the cult leader's back.
I think she has confused cults with obsession. While some people can be very domineering or abuse their authority (in active or passive aggressive ways), some cliquish and butt kissing behavior is inevitable, that goes on about everywhere off and online, and I wouldn't call it a cult.