Watch the entire video. DC park police explained nicely several times that they can't dance there (no public performances are allowed at DC monuments. This is to keep them being used for reflection and not public displays). He even said citing them requires an arrest because they live so far away. They were warned over and over and over.
Usually I'm with the fuck the police crowd but this is an example of a sensationalist prick goading cops into legally arresting him and then claiming he was violated. His whole goal was to create a "viral" video.
I have a word limit on my cynicism