I don't think its too spicy, I just think it isn't very smart or strategic.

The ACAB crowd obviously doesn't love Harris precisely because she's a cop, but as Transient Punk pointed out, the ACAB crowd didn't choose Harris and don't represent most of the Democratic party, who skew right-wing. (Whereas the back-the-blue types overlap much more with uncritical enthusiasm for Trump, who they see as an innocent man who has been wrongfully convicted by a corrupt and politically motivated justice system.)

The Democratic coalition made up of progressive, leftists, and more right-wing liberals holds together by pragmatically overlooking these divisions and cooperating against the even-further-right, and this meme sows division right before a major election where Democrats are divided (e.g. over Israel) and having a hard time unifying.

In that sense this meme will get a reaction, but again not because it is spicy but because it is divisive.