Definition of anti-vaxxerThis is bizarre.
: a person who opposes the use of vaccines or regulations mandating vaccination
First, the English language does not use a double-x. Someone who boxes is a boxer, not a boxxer. A tax collector would be a taxer, not a taxxer.
Second, someone against mandates is anti-mandate.
Would someone call himself anti-abortion if he is against abortion mandates? Anti-gun if he is against gun mandates?
I believe medicine should be based on informed consent, but such a view is not defined as anti-vaxxer.