I'm from Atlanta and the video was in the Buckhead IHOP that I've been to a few times. It was some black girl being loud as fuck, probably yelling out the lyrics to some "soulja boy" song just like the one in this MARTA train video in Atlanta a few years ago:
http://www.youtube.com/watch?v=cwkU-5OFPHY
Police description of IHOP incident below:
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"According Officer J. Vidal's narrative from that night — or, rather, early Saturday morning; just before 3 a.m. — the kerfuffle began when the women wouldn't shut up. He says he heard Cynthia Freeman — the woman whose collar he's clutching at the beginning of the video — yelling in the booth behind where he was standing, so he asked her to be quiet or leave. According to Vidal, Freeman refused, and told him that she's a criminal justice major and is familiar with the law.
"She stated that this is a public place and she knows her first amendment rights," Vidal wrote in his report, "I advised her that IHOP is private property and that I am employed by IHOP. I also advised her that she would have to leave the property if she continued to keep yelling. Ms. Freeman stated that she knew the law and wasn’t going anywhere. Ms. [Roberta] Caban [told me] to get out of her face."
Apparently, Freeman didn't believe that Vidal was a police officer. She said she refused to leave, and threatened to call the cops on him. That's when Vidal decided she was under arrest.
"I tried to get her out of the booth, and she resisted," Vidal wrote. He then says that Caban grabbed his arm and Freeman threw punches at his body."