People in the horse world have a different definition and perception of amateurs than the rest of the world.
Horse folk think of amateurs as ammy-owners: the over 18 crowd who jump their horses 3'6". Everyone else thinks of the fools who try to do things that they’re not quite capable of. It’s sometimes used as a put down: “What an amateur!”
The hard part is when you take a person who belongs in the second definition of amateur and put them in the horse world. I know all about these people. I’m one of them.