There's so many good points here but I'll put it into human terms. Let's take a professional carpenter and a football player, ignore their race, and simply look at their jobs.
Cody Carpenter can build you whatever you want, with whatever wood you want, in whatever size you want, and make it pretty. Cody C plays football with his friends, and he's definitely an enthusiast for the sport, but that's about it. Freddy Football Player can run faster than you, throw farther than you, take tackles better than you, and trains more than you'd ever want to in one week, in the course of one day. Sure, he builds birdhouses in his spare time, but no one said they were professionally done. It's just a hobby.
Boil that down to "blood-lines" as you would if you were purchasing a horse, or these two mens' services. Cody C's family has been in the carpentry business for the last century. He comes from a long line of well-educated men that are known for their beautiful carvings and creations. You might say wood-chips run through his blood and sawdust feeds his imagination. That is his bloodline. That is what he was "bred" to do. (For the sake of this example, I pull inspiration off of someone I knew who claimed to be born and bred for carpentry.)
Freddy Football Player comes from a different spectrum. His bloodlines may not have been proven football players in the years before he was born, but the people in his family were superior at running, catching and throwing compared to the other families around them. He's a diamond in the rough, but he's predisposed to being better at football than say, professional carpentry.
Now, you're looking through these guys' carpentry portfolios and you're considering buying their services to make you a custom built bed-frame. Freddy F's portfolio is cute. It's got some decent bird-houses and a stick project he helped his child with. Cody C's portfolio is impressive, it displays elaborate work on various wooden projects, including bed-frames and custom-build dressers. Consider this portfolio part of the mens' pedigrees and bloodlines. In the end, you choose Cody C's services over Freddy F's services. Why? Because when it comes down to it, carpentry is what Cody was meant to do and what he excels at, whereas Freddy F just enjoys the aspect of working with his hands.
Does that make you "breed" racist toward Freddy F? No. It doesn't. It shows that you took the time and carefully chose the person you were going to invest time and money into to get the best bed-frame for your money. You chose between two options; someone excellent at carpentry compared to a hobby-joe just looking to make a few bucks off of his developing skills.
Now say you're trying to get a famous football player to come to your son's party - your first thought is going to be with Freddy F, right? Because he already has the two major components that you need. 1) He's famous and 2) he's a professional football player. Best of both worlds. Sure, Cody C is great at playing with his friends! But it's not how he makes a living and therefore, it doesn't suit your personal needs. Are you "breed" racist in this scenario? No. You're not.
Apply the finesse that Cody C needs to that of a Warmblood or a Thoroughbred and the brute force/strength that Freddy F needs to that of a QH or a Paint. You want dressage and you want to go to the highest levels? You're looking for a proven Thoroughbred/Warmblood, with a good line behind it, that's got the means to take you where you want to go. Its ancestors were all high-achieving horses, it itself has major potential. Are you breed racist? No. You're realistically looking at answers to your demand.
You want to go on the rodeo circuit, calf ropin' and barrel racing? You're looking for a proven QH with the pedigree and bloodlines to take you where you want to go. Its ancestors are all proven, have all had miles put on them and won buckles, it's been selectively bred to have good hind-quarters with the desired gaits, strides, and temperaments. Are you breed racist? No. You're realistically looking at answers for your demands.
Is anyone else who realistically looks to lineage and pedigree to determine whether or not they want a horse or what they can do with that horse a breed racist? No. They're looking for realistic answers to their demands. Are the people who flaunt good pedigrees and bloodlines in your face breed racist? Sure, some of them can be. Some might just be snotty and want to have the best of the best in the eyes of everyone else (those folks never tend to be happy.) Are they worth getting worked up over? No, not really. You like your horse, correct? Go on with that knowledge and let idiots be idiots.
Every horse can do any job given to it, just like Cody C can play football with his friends and Freddy F can build his birdhouses. Not every horse can excel at ever job its given. Just like Freddy F may never become a professional carpenter and Cody C will never become a professional football player. Horses were bred with a sole purpose, breeds were created to generalize a group of horses sharing the exact qualities of one another and in order to identify what that group of horses was best at and most desirable for.
Pedigrees were made in order for humans to look back at a general history of the horse's ancestors and get a gist of what that horse was good at and whether or not that horse has any use in that person's lifestyle choices. It doesn't mean that the horse itself is useless if one person turns it down because the horse has no purpose being in that one person's life, it just means that the horse is an unrealistic purchase for that particular person. I wouldn't go out and buy a draft horse because a draft horse's skills are useless in my world. I'm not extremely overweight so I don't need a big horse to haul me around. I don't drive carts or plow fields so I don't need something that can pull something heavy. Does that mean that I'm a breed racist? No. I'm not. I like draft breeds, they're pretty and they make for good eye-candy, they're sweet, gentle, and they have their uses to those who need them. But for me personally they have no use or place in my world. So I'm not going to own one or buy one.
And no, a pedigree shouldn't be the sole defining factor in a horse's price tag, and the amount of money spent on a horse shouldn't define how "good" that horse is. It has to prove itself, its ground manners, and it has to find it foothold in the world. But it does play a key role in helping a prospective buyer determine whether it'd even fit the purpose the owner has for a horse.
Remember, they're not cozy little house pets no matter how much we love on them or want them to be our "bestest buddies," they were domesticated so that they could work for humans, doing tasks such as hauling buggies and carts, plowing fields, carting around their handlers or dead carcasses, or whatever else their job is. They have to have a job (even something as monotonous as lessoning students) and every job has a pedigree or bloodline associated with it. Naturally, there's going to be some judgements passed and generalizations made. Nobody is going to force you to purchase a horse with a ridiculously high price tag that stems only from bloodline, either. So if it really upsets you that much, just walk right by. :)
(PS sorry for the novella. Lol. Cookies if you read this all.)