My guess is that the fans of Lee (and other confeds) are from the south (deep south, probably) or have strong ties to that region.
I'm just not a fan of the deep south. From the pseudo-intellectual (imo) argument using states' rights to justify slavery (and to basically lie about the reason for the civil war- states' rights! not about slavery!) yeah, fuck that, to holding on to the idea that the south was some sort of genteel, noble region. I'm not a fan of the southern baptist church, either. And the current state of the deep south doesn't help matters: still virulently racist in a lot of parts, ignorant, clinging to god and guns. I know a guy who went to VMI a long time ago and they practically worshiped Lee. And Trump has emboldened those dipshits. In a way, that's good b/c we can see who they really are.
I'm glad to see that the USMC is prohibiting display of the confed flag (loser laundry). Did Lee do the noble thing by being a leader for the group that wanted to rip apart the US? The noble thing, imo, would have been for him to defend the Union. He was a traitor. He was, of course, a lot more than that. But he was a traitor. I'm not sorry if his statues are coming down.