That's not what happened.

Stupid leftist chick annoyed some asshole black dude who was trying to bird watch by having her dog off its leash in the park, which she shouldn't have.

Asshole black dude then makes a vague threat against stupid leftist chick's dog. Of course, she reacted negatively to this, and being a gutless leftist, instead of just walking away (in broad daylight when she was in no real danger), immediately panicked and called the cops and told the asshole black dude that she was calling the cops, and was going to give them a description of him, a black dude, which is something you typically do when someone is threatening you and you're talking to the police, even if it's for a stupid reason.

What her reasoning is for saying this to asshole black dude is pure speculation. But asshole black dude posted it on social media where it blew up and the BLM types ate it up as a case of racism.