Since my ex worked in vaccinology and put ridiculous amounts of time and effort into my work, this has always been a touchy subject for me.
I’ve only experienced one anti-vaxxer. Back when I was living in Brisbane a comedian I knew was having some short film made around his comedy. I wanted to help out and the filming was in a park near where I lived so I nipped out at lunchtime to join him and help out. There were only two of us who’d turned up in the end, and the director was running behind schedule on another shoot so we just stood around making small talk. It was all very amicable, if a little stilted when I was asked what I was doing in Australia and explained it was because of my wife’s work. When I said what she did, he made a “yeah, but you’ve gotta be careful with that stuff, right?” type comment. Realising what he might be implying, I asked him to explain further. Anyway, long story short, a few minutes later we’re all having a “raised voices” conversation in the park drawing attention from those around, with the other guy who’d turned up being strongly pro-vaccines also which ended up with us both storming off leaving the guy alone in the park to wait for his director friend. Afterwards the other guy tried to bond over the whole experience and said we should go for a beer sometime, but he was a dick for other reasons so I made one of those non-commital statements and never saw either of them again.
Not the best story, but all true.