Humor is a common but not a neccessary feature of satire. Satire can merely spotlight some aspect of society to foster critical examination of it.
Also, even if "Cuties" isn't attempting to prompt critique, it doesn't mean it's endorsing or glorifying or promoting the behaviors either. It may merely be being honest about some aspect of life. There is nothing remotely unusual about girls that age and younger mimicking the most sexual dance moves of their culture to the most sexual songs of the time. My step sister and niece did the same thing back in the 80's, and my first "girlfriend" in the 70's at age 7 got on stage with girls from age 6 to 16 in skin tight outfits and danced sexually to "If you want my body and you think I'm sexy" while all their parents and families cheered. Odds are this wasn't the first time those young actresses in Cuties had tried those "dance" moves.
Hell, there is a reality show dedicated to mom's who exploit their kids in dance competitions by having them perform sexualized dance moves in skimpy outfits, such as this "Country Cuties" episode of "Dance Moms". Who wants to bet that those mom's are among those "outraged" about this movie.