The Uttar Pradesh government on Friday banned Bollywood actress Madhuri Dixit's comeback film Aaja Nachle, alleging that the lyrics of a song in the movie were derogatory to Dalits

Is this right ? whats the context - can someone explain ? 

Mein ne galti kari thi
Meri nathni padi thi — 2
Ki sone mein usko ranga gai
Mein ranga ke atariya pe aa gai
Mohalle mein kaise mara mar hai
Bole mochi bhi khud ko sonar hai

Sab ko nacha ke nachle
Aaja nachle nachle mere yaar tu nachle

In India now everybody is moral police,, while i am writing this Punjab has also banned the film...Politics is making every aspect of India murky and dirty .

Hi, Could someone translate the offending line please? Thanks

In what way is this derogatory??????

 Excellent film by the way, Madhuri Rocks!!!!