Once upon a time, you’d have to go to a fan gathering or convention to hear people speaking Fan. It’s the way that they talked when they were such big fans of something they speak with the faux authority of actually being involved in the subject rather than just a fan of it. There’s a lexicon that used to be exclusively used by fans which included phrases like “season”, “character arc”, “Plot development” and so on. Regular people never talked like that; the most they might observe in those legendary water cooler moments of old was that a TV programme or film was “great” or “crap”
Not any more. Nowadays everyone speaks Fan. You hear people who’ve never worn a Klingon mask or screamed at David Tennant talking about “season five”. They discuss story arcs like you can buy them at Tescos. It’s spread to other genres too; now people compare the merits of the plots and characters of seasons 3 and 4 of Doc Martin or Spooks for example. Even James Bond, the perennially unchanging spy now apparently luxuriates in a character arc.