This film is Bunuel being an ass. He’s continuing a legacy of satire and challenging society at the time through film. I couldn’t get a translated version, but it’s basically just using the “surrealism” of his images to provoke the audience to question their social values. He's kind of overstepping his bounds with this movie in intentionally creating provocative images that serve more the point of being provocative than questioning social mores that he's trying to deconstruct. This film is what I would call a "Troll" film that really only exists to nudge you and make you uncomfortable not for any real social change purpose but just for the sake of nudging you.
The Spanish people and government seemed to agree and banned the film outright and made Bunuel a persona non-grata.