Which movie/person do you think has the most annoying fans?

Tarantino's fans are definitely annoying... George Lucas' fans are up there as well, but primarily for their zealotry and the sheer volume of reeeeing online that crowds out any discussion...

In terms of movies Alien/Aliens fandom can be a bit vocal, but they're not really annoying... You can have an interestind discussion... I've had many in relation to Alien 3 and Prometheus in particular... especially as different directors took a shot at redefining the series from Cameron to Fincher to Scott's several attempts... The same thing can be said for BladeRunner...

The superhero fandoms in general are pretty intolerable... But they're a bit dispersed across so many movies and tend not to spillover too much in other movie discussions...

I'm surprised no one's mentioned Rick and Morty.

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Donald Trump

Apologies for dragging politics over here, but he was a tv personality first and his cult fan base started there.

A Clockwork Orange (actually you can say pretty much any Kubrick film, a lot of pretentious dorks like them...)
The Daniel Craig bond films (when people act like just cause he doesnt smile, raise an eyebrow or make any puns that means he's the most amazingly deep actor who ever lived or something and all his films are the new Shakespeare)
Fight Club
Wolf of Wall Street (ugh)

I also hate "Troll 2" fans twofold, because 1) Troll 2 is NOT "so bad it's good" it just sucks, and 2) I am a genuine fan of "Troll" (1986) the movie whose name gets unfairly besmirched and forgotten.

What about P.T. Anderson fanboys? Even a positive criticism about any of them and they act like you're ignorant and stupid.

In music, Radiohead fans are like that. Perhaps not coincidentally, there seems to be a huge overlap between fans of Radiohead's music and P.T. Anderson movies.