Semantics perhaps, but this is my experience. In the other classes of livestock I have had over the decades, people seem to be confused about the definition of "breeder." There are plenty of producers, raisers, etc. out there who think they are breeders because at the basis of that word they are, indeed, choosing to put a particular male with a particular female and therefore allowing/causing the "breeding" of those two animals. On the other hand, I use that term for someone who does their due diligence in gathering information and researching seedstock decisions, has the intention of improving their chosen breed, has definite goals in that direction, willingness and ability to cull toward those goals, and resources to follow their plan with integrity.
Now, to the word "culling." If an animal that you are responsible for bringing into the world has a defect that will cause the animal undue hardship/pain now or in the future or is a non-viable situation (would not survive on their own due to the defect), I say euthanize them. Cleft palates in puppies, extreme dwarfism in miniature donkeys/horses leading to extremely painful early onset arthritis (in a 2 year old), that sort of thing. But if an animal has a DQ for breed standard but can still live a happy and productive life by bringing joy as a pet or companion or still fulfill a purpose like food production, I am all for it as long as there is full disclosure regarding the defect with the clear statement that this animal is NOT breeding quality and should not be bred (or would not be bred by the person selling it) including the specific reasons why not.
We cannot control what other people do after the sale, except perhaps in the case of registered animals to some degree. I have sold a pedigreed and registered animal without their papers, notifying the registry that the animal was sold as pet quality and a non-breeder which is my right as the breeder of the animal. (In this case, the registry defines the "breeder" as the owner of the dam/mother at the time of service/insemination.) This doesn't mean the buyer or someone down the line won't breed the animal, but it won't be a registered/pedigreed offspring. Of course chickens aren't registered, but I'm hoping my point regarding ethics, integrity, and intent is coming across.