The irony is honestly hilarious.
The Sky People constantly call themselves "the people of heaven" and label everyone else as "beasts," yet they're the ones enslaving women, forcing cruel rituals, treating people as inferior because of bloodline, and justifying it all as something sacred.
Meanwhile, the so called "beast" people are shown treating their own people with dignity, allowing even a maid to speak her mind, and punishing someone who tried to abuse her regardless of his status.