I think the cop handled it badly, but he didn’t do any permanent or even temporary damage to anybody and the other officers who showed up seemed to be able to handle it better.
That said, this thing with kids crashing a party because of Twitter messages - which is certainly not only a black thing - has got to stop, because it has resulted in a number of seriously bad situations.
We used to have mini-riots in one town I lived in because the kids would send out invitations to everybody they knew to come to the house of somebody nobody knew...except perhaps the person who had sent the invitation ... and there’d be literally 500 kids there, looking for beer, in no time at all. The cops in town were specially trained for dealing with this, but even so, there were a lot of arrests and confrontations.