I own an Equestrian Facility and have had numerous horses come in and out. The one thing I can tell you is that horses are an excellent judge of character. When ever interviewing a perspective new boarder I take them around and introduce them to all the horses, mine included. If the horses act indifferently to the person I don’t take that person as a boarder. Maybe your horse is telling you something either about the energy of the place or a person there. Just a thought!