A movement with a distorted sense of individual rights that would seek to hamper vaccination in the midst of a global health crisis is reactionary to the core and hostile to human life itself. The dangerous rise of the anti-vax far-right is a symptom of a sickness in this society that we will still be confronting well after the last wave of the pandemic has finally receded.
That’s a No True Scottsman argument.
The Nazis instituted a ton of socialist welfare programs, issued a lot of propaganda to that effect, and even instituted universal healthcare and free higher education.
By the textbook definition, they were socialists.