People who say they hate thoroughbreds (or any particular breed for that matter) probably have never owned one. If they have, they probably had a horse that was too much for them and rather than blame themselves
for the horse's behaviour or otherwise be a little introspective, they choose to blame the breed.
Either way it makes these types of people ignorant in my eyes and whenever I hear those types of wild assumptions from someone I tend to disregard all further verbal diarrhea that is spurted from their cake hole.
Not suited for their purposes? OK. Not their breed of choice? Fine. But HATE? Nothing short of ridiculous, misinformed and very unfair.