In the end, it's about numbers. There are more people opposed to anything Confederate than supporting anything Confederate- and the pro-Confederates have no one to blame but themselves. Upset about this attack on your heritage, your traditions? It's your own actions coming back to bite you. Every time someone was told "Get over it" when they complained about the CBF, every time someone was told to "Grow a thicker skin" when they protested about the presence of Confederate monuments in their communities, and every time a Southern politician proposed a law prohibiting removal or renaming of anything Confederate in response to a community's desire for change, there was an increase in the anti-Confederate camps; now that they have numbers on their side, there's no need for a conciliatory or negotiated approach, and they're free to use the same scorched-earth approach that was employed against them for decades.
You see, the CBF isn't a symbol of "Southern Pride"...it never was. It never represented Southern Unionists, it certainly didn't represent the millions of slaves, and it likely didn't represent the free black populations of the Confederate states. So how could this flag- a battle flag flown by men who were tasked with killing United States Army soldiers and United States Navy sailors- represent "the South"? Of course, anyone can claim that the flag represents them, but there are lots of people it doesn't represent, despite grandiose declarations to the contrary.
Bottom line- you reap what you sow. For years, it's been taken for granted that people could put up markers and monuments and flags and banners in support of the Confederacy wherever they wanted; anyone protesting was dismissed, disregarded, and often disparaged- even now the accusation of "PC" is thrown about recklessly. So long as the pro-CSA camp was in charge, there was never a problem- as they saw it. But they're losing that grip, and they don't like it, and maybe they have an understanding of what it was like to have their concerns ignored, their protests dismissed? Maybe they can empathize with those people who didn't like anything CSA, but had to grit their teeth and deal with it.
However it works out, it won't be pretty- there's no real urge for reconciliation on the part of the people who now have momentum on their side; the more the CSA supporters dig in and ramp up their rhetoric, the more people will gravitate to the opposition. The opportunities to mitigate this are few, and dwindling...good luck!