He's got a point.
The same charge could be applied for you cussing your brother-in-law for some BS he pulled at Christmas dinner. Third degree applies to harassing communications and it can apply all the way down to a room mate, of no relation, who you threatened because they were stealing your stuff.
... and it's reinforced here,
@SnakeDoc
The charge has such a broad umbrella it's a quick "go-to" for LEO.
Perhaps, until we know more, we can let this sort its own way out?