I suspect the police in this instance are 100% okay with it.
Think of it as positive public relations.
https://www.youtube.com/watch?v=GTlhhxN38EE
Since it is Chicago, wouldn’t surprise me if the twerkers were off duty female cops.
Given the crowd around them, I think the cops were just glad that all they had to deal with was just twerking, and nobody throwing rocks.
They sure were not asking them to get off or stopping. Likely afraid to stop and get out. Sad.