I think I meet 4 or 5 people a year who tell me that their horse hates men. Almost always the horse is a mare. They tell me how cranky their horse behaves when handled by men.
We study the behaviour of horses interacting with other horses and then write books and give lectures on horse herd behaviour, as if our observations are definitive. Is it that simple? Are horses that simple?
I received an email from someone asking for suggestions on keeping her horse's attention. They said they deliberately keep their session to only a few minutes because their horse can't focus for more than a 5-10mins.