Angry black man and Confederate flag tropes really lame in this movie
As soon as the two black characters enter the house and see the Confederate flag hanging in the room, their attitude toward the white hick couple (who, of course, are portrayed as a couple superstitious, irrational weirdos) is pretty much cemented in the negative immediately before even any dialogue has taken place. In spite of the fact that the local couple do or say nothing to indicate they are racist, the two black characters basically treat them like idiots and losers.
Personally, I can see why they might want to throw this kind of garbage scenario in there due to current events and everything, but if the behavior of the "protagonists" toward the local couple is considered realistic, then can anyone genuinely claim to be surprised that Donald Trump has the overwhelming support of Middle America? Same situation during the Russian and Iranian revolutions, poor rural folk and commoners getting fed up with the arrogance and political correctness of cosmopolitan elites.