“It’s just a joke bro” the ultimate criminal defence.

The prosecution established the defendant’s intent to reduce the turnout of black voters “ For example, on November 1, 2016, in or around the same time that Mackey was sending tweets suggesting the importance of limiting “black turnout,””

That’s mens rea.

Something being a meme does not make it a crime, but a crime being a meme does not make it legal.