Honestly... I think the vet techs were simply being blunt. At least that's how it sounds, to me. I expect that kind of thing when I start off at a new Vet, or I don't know the tech. They assume a lot, based on the average pet owner, and it usually does take blunt, direct statements to get a message across to MANY people about their pets. This kind of reminds me of the Obedience trainer situation. It isn't easy to hear people give you constructive criticism about your dog, but they are (usually) completely well-meaning... but I've noticed that a lot of people who work with pets become jaded by all of the irresponsible owners, and can get very direct about their advice.
I feel that talking to new techs in a knowledgable manner, and making it clear that you ARE an aware, educated, responsible dog owner can really change a blunt/snarky tech's tone. Also, just getting to know them and them getting to know your dog is important. You should not feel uncomfortable or nervous when going to the Vet... I would switch Vet's if I felt that way. However, it's also important to have a thick skin, and not take a tech's advice as a personal attack. Everyone has something that their dog is critiqued for - with Gonzo, it's his uneasiness with strangers/strange dogs - with Fozzie, it's usually his "thickness". If some one (especially some one in the field of training/caring for/vetting dogs) offers me advice about either, I'll listen, and usually I will take it with a grain of salt.