I agree with you. I don't want people whacking on my horse either. I board my horse also. There are horses at my barn that I don't think have the nicest personalities......will bite out at my horse when I'm near, or try and nip at me when I reach in to pet them or walk by, etc. I don't feel a need to go disciplining them. I simply leave them alone. I make sure me and my horse aren't close enough for any such behavior. At a boarding facility, you get to know other peoples horses, so it usually becomes common knowledge who's horses are warm and friendly and who's you should generally stay away from. If I catch anybody hitting my horse with anything, they better be prepared to fight. I don't discipline other peoples horses, and they better pay me the same respect. If someone doesn't like my horse, then stay away from him. It certainly doesn't sound like to me that the OP's horse is just randomly attacking people in a pasture, so I see no reason for others to have a need to discipline him. I especially feel this way if the horse is on cross ties or in his stall....I mean come on, those should be situations easy to avoid (the horse can't go anywhere). A lot of times in a boarding situation you have a lot of know it alls who discipline because they think they know best. I wouldn't tell them the 'proper' way to discipline your horse...that is just giving them permission to do it. I would tell them straight forwardly that you do not want anyone but yourself and your trainer disciplining your horse. That's not to much to ask.