Sorry but I think it is par for the course.
I'm very pro vacine - I'll just get that out of the way so you know I am biased.
You may well have done a lot of research, and it may actually be research from good sources (peer reviewed journals, PubMed etc. etc) But, and it is a big but, you will be one in a million.
The vast majority of people who don't vaccinate do not research properly.
I had a rather heated discussion with another poster who kept saying "why can't scientists tell me this is 100% safe?"
Well a scientist cannot say that because there is no proof something is safe for everyone. Even water. We allow children to freely drink water, we drink it ourselves. As lay people water is safe to drink. To a scientist it is safe to consume in most situations but in some can be poisonous or cause great harm (do you remember Leah Betts?).
So the Dr, HV, receptionist, nurse does not know if you have researched properly or have just googled a few anti vax sites, and most people objecting to vaccines (not those with health issues that prevent vaccination) have got their information from Dr Google.
You are being tarred with the same brush.
Health care professionals are encountering diseases that where virtually unknown 20 years ago. Things like whooping cough.
It's not personal, stay calm ad assertive.
But please understand that a child registered at that surgery may have died that week due to a disease that can be vaccinated against, someone with a poor immune system might have caught something that they would not have done if vaccination rates were higher.
If you were employed by a GP, even as a non medical person such as a receptionist, and you used to see a child on a regular basis, but you don't now because they died from whooping cough, measels, or even diptheria wouldn't you be a little bit aggressive when you encountered an unvaccinated child?