Why do art films make people so angry?

And one further note. I think that it is critics who make art some obscure intellectual thing. Of course there are intellectual movies and such, but not everything is meant be read like a philosophical tractate. It is always funny how critics find deep meaning in all kind of things. These people probably could find deep meaning in a dog shit on the doorstep. If I remember correctly the story, Flannery O'Connor once lambasted critics for making up some deep meanings in her story "A good man is hard to find". She basically said that the story is what it is and that is all.

It is about inspiration, creativity and aesthetics. Certainly there is no need to be a quantum physicist to get it, and maybe you mustn't be one to actually get it (just remembered a video with Richard Feynman on Youtube where he was describing a flower in some pseudo-poetic scientific language, pretending that he has deeper insight, and people in the comments were like "Oh, man, that is some deep shit!". No, buddy. It is retarted. He better stick to his formulas).

Well, speaking as someone who has discovered he enjoys art films (including this one) relatively late in life... I think it's less to do with the films themselves, and more with a certain subset of the people who watch them; to wit, your pretentious, sneering "oh, this is just too smart for you, go watch [insert-popular-mindless-film-franchise-or-director] instead" type.

They also can be willfully obtuse, pretentious and/or self-indulgent, and it's fine for people not to enjoy that. Case in point, this film appears to be Carax's attempt at an La Nuit des horloges (2007) of his own, and that film was basically Jean Rollin making a tribute to himself. I thought the result was certainly entertaining enough, but I can totally understand why someone could consider that a pointless waste of their time.