I had been seeing this graffiti--"ACAB" written everywhere for a while. I decided to look up what it means.
It's supposed to be short for "All Cops Are Bastards." Don't know if I would substitute "Black Lives Matter" or "Defund the Police" with this. Still, when that graffiti is being blatantly sprayed over with ugly black paint, I can see why this would happen.
I can also see why people might also be writing this in code. Take my photo below as evidence. Substitute each number with a letter in the alphabet, and you'll see what I mean.
I would have doubted my research if I hadn't seen this "Defend Your Police" political message on Friday.
And I saw the same letters scrawled in the lower right corner.