Who were the good players in Charlottesville?
It's interesting that you cite your superior rationality, but still object to the statement about honoring the confederacy.
The Confederacy was, explicitly, an insurrection with the goal of creating and maintaining a society that deemed slavery as the "proper status of the negro in our form of civilization."
Monuments to the Confederacy, and the veneration of Confederate symbols (as with the flag in our state and others) honor the Confederacy, which was an explicit expression of codified white supremacy.
So in elevating them, we both honored the history of this explicit system of white supremacy and, quite often, did so in a specific context that was intended to promote and uphold a contemporary system of white supremacy. If you scratch the surface of when and why these symbols were elevated, and over whose objections, it's clear as a bell.
Fast forward to today, when those same symbols and markers are cherished by people who advocate an explicitly white supremacist worldview.
Taking a legal position that these symbols are allowed to be displayed by others has been litigated and re-litigated and is pretty well understood. Supporting the continued elevation of symbols of white supremacy in our public spaces (which is what "liking" them means, right? We're not talking about aesthetic preferences here, are we?) given the context provided above is categorically different. It doesn't make one a white supremacist, per se, but it does align one with 150 years of white supremacy. That may be unpleasant, but I don't see how it is defamatory.