Public schools want to teach sexual matters from Kindergarten, and to make sure the kiddies know all about sex, safe sex, anal sex, oral sex, masturbation, mutual masturbation, gay sex, etc. The schools thus stimulate, or overstimulate our innocent youth. Heck, coeducation is overstimulating in itself.
At the same time, Twerking is sexual harassment of some sort. How a Twerk dance harasses anybody is beyond me. It's meant to be silly fun. As Instapundit says cleverly "Welcome to the neo-Victorian era — bringing back the censoriousness, but not the virtues..."