The reason conservatives don't like it is because they are a bunch of racists and don't like being called out on it. These scumbags would have you believe that slavery was a good thing, that slaves liked being "taken care of", that the Civil War was about states rights and NOT about slavery, that the civil rights movement in mid century America was not needed and never happened, that the Mormon Church never engaged in racist behavior, that the Southern Baptists did not start out as a haven for racist beliefs, that the minority disenfranchisement efforts of today's republicans are based on an actual concern for secure election, that their "Southern Heritage" is a real thing even though most of them aren't even Southerners, that there was no such thing as the "Southern Strategy" designed to get Souther racists to become republicans and so on and so on....
Bottom line:
YOU CAN'T SPELL RACIST WITHOUT THE (R)