People dumb down their speech to people they consider less informed or less intelligent than they are. So Joe was simply stating what it is the Democrats believe. Elizabeth Warren stated an outright lie when she said that Mike Brown was murdered in Ferguson. Never mind that no such finding was arrived at by investigators. Never mind that Witness 101, who reluctantly testified because he was afraid for his and his mother's safety, provided testimony that backed Wilson.
For Democrats, everything bad that happens to black people is the fault of some white man somewhere.That black people are agency less, children who are being blown around by the vicious winds of "white supremacy". Black people locked up? Must be because of some white man rather than the dead body. Black kids not performing in school? It's because of some white man somewhere (other than in the seat next to them providing good grades by osmosis).
I said it before and I'll say it again. When Democrats see black people, they think "slave". Add "poor" and "stupid" to that list.