Mercy! I read everything over twice because somehow I seem to have missed the genesis of the conflict! I don't think anyone is actually intending to hurt anyone else's feelings.
I only have one comment about the original post. There seems to be a greater instance of medical problems (colic, lameness, etc.) simply because veterinary care has improved and horses are living longer. In my day, if you got a horse into his 20s you were doing well, and a horse in its 30s was almost unheard of. Now, a 30 year old is nothing unusual. Longer life means more opportunity to develop medical problems. Increased knowledge of common equine problems by owners means that a vet will be called out when there is still time to fix the problem rather than the animal being sent to slaughter as it stops being able to work.
Oh - one more thing:
All of the show accessories that they have now make me laugh. I was trained hunt-seat, and in those days you were being wild if you put colored rubber bands in your horse's mane! Too much hoof shine was also frowned upon and considered "tacky". Now I see horses out there with colored hoof polish, stencils so that you can spray glittery designs on their butts, and who knows what! Ah, to be an 8 year old girl again!