The audio of the police communication is here, I suggest listening to it.
I can - at times - catch the sound of someone in the background speaking loudly, but it does not sound to me as anything that could be described as screaming. Listen at 2:16, 2:45.
Gates sounds like he was being a jerk, but that's not illegal. I know police officers have a difficult job and deserve our respect, but I don't approve of "contempt of cop" arrests. And that's what this looks like with the information I have now. Not at all racist, that's garbage, but a "contempt" arrest.
the picture is here; I suggest you look at it. Who are you going to believe, Gates or your own eyes? Why do you think his mouth is open so wide and why do you think the LEO in the forground sided with Crowley?