You're not supposed to be dry humping the the whole time, but dancing with her. I was a dry humper too when I was first learning to dance. Nobody taught me, they just unleashed me on a party full of booty shaking and twerking. My friends had to explain to me that you're not supposed to just dry hump the but it's an art form.
Barely a 10-minute segment passes by without the viewer witnessing 11-year-old in tight clothing humping the floor, or camera shots that zoom in on their butts, accentuating every crevice and curve. This occurs when members of the young cast are in short shorts or even just their underwear.
It's an elongated dance segment where the hump, twerk, and grind, and the camera catches every awkwardly disgusting moment, but it didn't need any of that. Throughout the entire film it's been building up to their inappropriate dance competition, and this is where the director could have used the audience's imaginations against them.