Was this set in a bizarro universe or something? *spoilers*
Nobody acts like a normal human in this entire movie. It's complete nonsense and seems to be taking place in a parallel universe where everyone is on downers or has the IQ of a fetus. Anyone else would have left within seconds of showing up to this party at the ex wives house - which used to be his.
Someone slaps a man and nobody reacts at all. Someone else has a group of friends over and tries to convert them to his cult like it's just another day for everyone and this kinda stuff happens all the time or something. Another is a lady they met in Mexico and took home with them like she's a souvenir frog trinket with crazy eyes. Another locks the door from the inside and takes the key, and is even called on it, but everyone says the one who noticed is the weirdo.
There's no cell or home phone line but nobody seems to care if theres an emergency. A guy puts on a video of a person dying and everyone just kind of shrugs it off within minutes. One girl just randomly makes out with someone in front of her husband and everyone just walks off to the table for dinner like nothing happened. One is a recovering addict who is offered coke. One lady asks to leave and is denied at first. Someone is at the door and when asked who, the host responds 'some people on foot looking for a party' as if people just walk around the cliffs hoping to find random parties or something.
What the hell is going on in this movie? None of it makes any sense or resembles a reality we live in. The characters are annoying, the plot is outlandish, and the whole thing is so impossible to connect to that you're just numbly staring at the screen for the entire runtime, not really caring about what happens to anyone that's dumb enough to stay at a cult party with a locked door and no means of communication with the outside world.
The one character who bring up all of this absurdity is told HE'S the one acting weird and freaking everyone out for some reason. Then when given the choice to leave the party, which he just pointed out was weird, he says no for some reason. Repeatedly. Then when he wants to go the girlfriend conveniently says no this time, again for some reason we're not privy to.
Then the big ending happens, and the guy who has been built up the entire movie to show us he's totally insane kills someone, and it's supposed to be a shock. We've been seeing clues all night that this was going to happen, the main character literally says them out loud. Then the one person who's not a regular in the group is also in on it. Twist! Except we all saw it coming of course, because he's the odd man out. All of this was telegraphed an hour ago when they talked about how great the afterlife is and showed that video. None of it was a surprise.
The character literally points out why they should leave throughout the entire runtime of the movie, but never does. If you were taking a writing class and turned in characters who act like this you'd receive an F and be told to do it again. I've seen fantasy movies that made more sense than this dreck. What a waste of time this trash was, I really should have just taken a nap or stared at the wall for 90 mins...