Police were starting to question the other partygoers and he kept putting himself in the conversation. They asked him to "C his way" out of the conversation, but he wouldn't.
He kind of did and even moved away when they said so just not as much as someone wanted him to. But regardless, the orders issued seem to have been illegitimate. Citizens (and anyone else for that matter) need not follow illegitimate orders. If you then get into trouble for not following illegitimate orders, it is illegal. This applies to both soldiers and citizens. If a soldier is told to torture and he refuses to obey informing his superior it is illegitimate and his superior punishes him, the superior will be accountable to the law. Likewise, if a police officer illegitimately (for example with no reasonable suspicion or probable cause) orders someone around on their own property to move this way and that and then gives physical consequences for non-compliance, it is illegal. The illegitimacy can be observed by the police explanation "we think boys and girls are up to no good sometimes around here or whatever" or whatever similar thing they said. That is nowhere specific enough to be a reasonable suspicion and clearly does not meet anywhere near the requirements of the fourth amendment.
While that's technically true, you're never going to win this argument outside of a courtroom.
My recommendation to anyone considering this is to verify that the issue you're making your stand on really truly violates your conscience. Because you're probably going to eat a knuckle sandwich, lose your freedom (if only temporarily), or worst case be killed.