If he wants all his neighbors and the rest of the world to know he's an asshole racist, it's his right. But that does not mean it has any place on public building, public land or places that the public goes to like shopping malls and other private places open to the public.

My son in law flies the American flag and the Irish flag on his property. Of course the Irish flag is a flag of victory of the Irish over the British. Why anyone wants to fly a flag of defeat, which the rebel flag is, makes no sense to me.

but why?

I've known some Civil War reenactors. Why they want to do it is beyond me, but it's a social thing. The wives dress up in the bell shaped skirts and they have a big pretend day where they put themselves into those roles like actors. Even though both sides are supposed to be enemies, they are in fact all friends and know each other. So my guess is that some of his buddies on the Confederate side convinced him their flag was a patriotic one for them. But I really don't know.

But there are always consequences to inappropriate decisions. He was getting enough negative feedback that he tried to explain his inexcusable actions by posting a sign under his flag to explain his intentions, “Americans fought and died under this flag," but he got it all wrong. Traitors who seceded from the US died under the Confederate flag, not Americans.