Just as he has the right - of any business - to refuse to serve certain customers for any reason he likes (e.g. they may be libtards or pussies), any customer has the right to patronise or not patronise any business at all for any reason they like (e.g. it might be run by an odious piece of shit)
So apart from being an odious peice of shit, the man’s an idiot, as he seems not to understand this.
If they were into trolling, the schools should book some visits there and ask for a classroom to use to tell kids, after the re-enactment - about how the civil war was about slavery and the fight continues today in forms such as Black Lives Matter and similar. He’d soon refuse to entertain their custom … and then they could sue him! 
