My experience couldn’t have been further from yours. Most of the anti-vaxxers I encountered both irl and online were of the kind that is all about natural remedies and distrusting of GMOs and such (as opposed to those distrusting of government and believing in conspiracies; that kind i mostly encountered online only).

Just google for outbreaks in the US that are linked to anti-vaxxing and take a note of their locations. Most will start in heavily left-leaning areas. To clarify my point, I personally believe that anti-vaxxing is about evenly distributed between left and right wing, just for different reasons.

P.S. As I was trying to find an article about an outbreak in Seattle that I remembered from a few years ago, I realized there is another one happening right this moment https://www.seattletimes.com/seattle-news/an-anti-vaccinatio...