Yelling "fire!" in a crowded movie theater just because you feel like it is still frowned upon though. A lot of these characters seem to relish in touching their toes to that fine line.
I unfortunately indirectly know a conspiracy believer. They also buy into a lot of the UFO conspiracy stuff too. I once pointed out them an alleged photo of a Nazi prototype flying disk was a doctored frame from Earth Vs. The Flying Saucers. (Arguably a pretty good photoshop job, but I know my old movies.) I even showed them the exact frame from the movie that was used and they still weren't buying it. (They think somehow Ray Harryhausen had access to classified info to base his effects on.) I pretty much wrote them off after that. Arguing with inanimate objects is more fun.
The sheer level of conspiracy crazy in people looking for secret messages from Stanley Kubrick hidden in The Shining is both amusing and terrifying. It's a shame he isn't around to enjoy it.
I wonder if conspiracy theorists were around during the American Revolution?