I think some people don't get just how offensive Confederate monuments can be, because most of them are intentionally couched in language that obscured what they represent. This is similar to how, in early US politics, slavery was referred to as "the peculiar institution" or even more vaguely - e.g. the original US Constitution never says "slave", but instead talks of "free persons" and "other persons", or "persons bound to service".

But some of them are just so inherently offensive, the contents overpowers the presentation - e.g. the "faithful slave" monuments and memorials. Perhaps contemplating these might help understand more subtle problems with the rest, so here's a few examples:

https://www.hmdb.org/m.asp?m=42188

https://www.flickr.com/photos/jstephenconn/5136209868

https://docsouth.unc.edu/commland/monument/245/

https://commons.wikimedia.org/wiki/File:Slave_memorial_at_Pr...