Sounds like you ran up against a power-hungry-PMSing little snot at the vet's office. They really exist. I, too, am an animal lover, and have enjoyed the company of many over my years on this planet. Every now and then, I've come across someone like this, wishing they were in "power" over you as an animal owner. What I would suggest to you is to just take your precious kitty home with you in a peaceful manner, never go back to that particular vet, and let the doctor know why, after the fact.
A man who loves his animals is very appealing to humanity. You rock, Roger.