Depends on the person. No doubt this does explain some of them. But it is hardly the majority.
Take myself as a prime counter example. I worked as a COVID-19 research scientist. I beleive that if you dont take the vaccine you are a complete and utter moron. Regardless I am against mandatory vaccines. Most people ont he left screamed anti-vaxxer at me, when clearly i was pro-vaccine, they just refused to hear any nuance in my stance.
This is what the left routinely does, what you just did. Pretend like you hear an argument which isnt the argument being made (or made by a small minority) and then turnt he toxicity up to 11. The truth is most people who were against mandatory vaccines and labled an anti-vaxxer weren't even against vaccines, at all. You magnify the 1% most idiotic of the other argument and then pretend like its the majority. Worst yet, its a lie repeated so often people believe it.