It actually *is* something to joke about. Actually because such terrible things happened. And that seems unrespectful, but actually it's not. These jokes are merely meant, like I said before, to come to terms with the fact that such bad things happen. You are only unable to deal with the matter through jokes, and that is fine, but you can best distance yourself them from those who do use jokes to get through matters like this. And don't tell me about personal traumas, having quite hundreds of them myself, living in fear every day, about things you can scarcely imagine, and three guesses how come I didn't yet lose myself... Exactly by joking about it.
I too am shocked about police brutality, and oh, I've also my personal reasons to hate cops with passion. And I hate all forms of discrimination, which includes but is not limited to racism. And three guesses how I can get my head cool about it, and how I can keep on having the strength to observe the phenomenon as neutrally is possible? Yup, through jokes like these.
So move on if you can't handle it when people do this to get to terms with things like this. The internet is for that too. And this was nothing more but a silly pun. Nothing more than that. When the jokes are really meant to insult black people it'd be a different story, but that is not the case, this is just a pun and nothing more.