They are biased. By their definition of “anti-vaxxer” people who merely oppose vaccination mandates are anti-vaxxers as well. [1]

Which is, frankly, quite insulting to me, because I’m vaccinated, and consider myself by no means an anti-vaxxer, I oppose vaccination mandates.

But Merriam-Webster says I’m an anti-vaxxer so I guess I must be one ¯\_(ツ)_/¯

[1] https://www.merriam-webster.com/dictionary/anti-vaxxer