Well said Kareen!!!
I have actually had to chase people out of my fields along the road( so actually tresspasing) because they wanted the “cute” photo of my horses.
I agree that the trainer should respect the owner’s request not to share photos of the horse they own. From the OP, I think that the photo was shared with the breeder and the breeder posted them??? If so, telling the trainer not to share may have been only part of the issue if the breeder was not also asked to not share.
But on the other hand, as a breeder, I love getting updates about my horses. I do not share photos unless I have permission.
To those who say that once the horse leaves your ownership and you have no input— you are absolutley correct. Breeders are in the business of selling or they would not exsist. Then no one would have any horses to ride. However, we do put the blood, sweat, tears and money into these youngsters until they leave. We think of them as our children/grandchildren and are always interested in hearing how they are doing.