There is a facebook post floating around from someone who lives in the neighborhood: Warning: Spoiler! (Click to show)
No idea how accurate this is. The DJ in question has deleted all of the tweets about the event, claims to have simply been hired and paid to play (and not to have been promoting for the event). Has tweets saying things like "I try to be the best person I can be, but some people really test that" and "To many people try to go out of their way to destroy my career. Why? They can't even say. All I'm gonna say is, bring it on. #makeurownpath" as well as a retweet from the "CEO" of DallasRagers that says "I just really dislike being lied to, specially when it comes to business" (I think this came out before the event...but they sound like the sort of people who would throw illegal parties if there was money in it).
So who knows for sure what happened. What is clear is that this party was not supposed to be happening. It was in an HOA community and not open to the general public (and any event would presumably require reserving the pool and probably paying fees to the HOA).
Didn't help that the locals made comments like "Go back to your Section 8 home" in a community that has previously paid fines for blocking the construction of affordable housing...but I certainly wouldn't be happy if a bunch of non-residents (of any skin color) hopped the fence and started throwing a party in my condo building's pool.
The cops being called by the residents might be entirely warranted. No one in this thread seems to be disputing that, though I am aware that the initial perception was that it was only due to black kids being there that there was an issue. Regardless of all that, the asshole cop's behavior is an entirely separate matter that deserves criticism.