I agree with you that racism was almost certainly involved here. But I'm afraid that I have to disagree that cops don't do this to elderly white people. Unfortunately, I've been witnessed to dozens of similar videos or cops brutalize white people in very similar ways. I'm thinking of a particular video in which a white cop picked up an elderly white man and threw him so hard onto the ground that he later died. The cop was not disciplined or found in any way at fault, even though the elderly white man was not a threat to anyone and had committed no crimes.
Certainly, police brutality is more often and disproportionately directed at Black victims. But something body cam footage is showing us is that police brutality is a serious problem across society and racial lines.
I watched a video the other night where three black cops beat the hell out of a black man who had broken no laws. He wasn't interested in talking to them, so he simply looked away from them when they were barking orders at him.
One of them walked around to the other side of him and punched him so hard with a closed fist that he fell to the ground and cracked his skull.
The other cops laughed and joked while they were waiting for an ambulance. One of them told the victim that, "We tell you to do something, you do it. Or we jack you up again. Bet."
The police department investigated the incident and determined that their officers had done nothing wrong.
This is the culture of brutality that I witness almost every day, and it's not always racism.