HIPAA doesn't forbid anyone from asking your vaccination status. It does prohibit healthcare providers from disclosing the information without your consent.
This is outside my professional specialties, but I've researched and written a bunch of articles on HIPAA and have a fair idea how it works.
Liberdon is a Mastodon instance for libertarians, ancaps, anarchists, voluntaryists, agorists, etc to sound off without fear of reprisal from jack or zuck. It was created in the wake of the Great Twitter Cullings of 2018, when a number of prominent libertarian accounts were suspended or banned.