I have not read the source material, only what you have cited in this post.
I think the vet having to clarify his stance with a negative referral to the organizations he is not a part of was unnecessary. Then-again, I am a master of abusing the unnecessary, but I try to keep things positive if possible.
A question which discusses an organization is this one, which implies negativity towards Marshall Farms, the largest ferret breeder in the U.S. Understandably my answer to the question cites negative attitudes of third parties towards Marshall Farms, but the answer I provide does not put the company in a negative light; it tries to state as close to fact as can be presented and deliberately points out when statements cannot be fact-checked.
I have also related my experience with a pet insurance company, but I tried to state only facts, which I can back up with paperwork if necessary. At no point did I disparage the company I used.
I think keeping personal opinion towards organizations without cited justification or explanations of personal experience should be kept out of answers or justifiably excised by editors with explanation in the comments.