These protests have been against some reported remarks by SRK against Valmiki ji (where he merely repeated what the contestant had said). The protestors burnt an effigy of the actor.
The assembly elections being round the corner in Punjab and the Bahujan Samaj Party having a reasonable presence in the state, the 'Valmiki' population is their traditional vote bank and every little opportunity is being exploited by other political parties to win them over.