The burden that promiscuity-derived HIV imposes on the healthcare system is not hypothetical.
And no, laws against high-risk sexual activity have to do with discriminating against a behavior, not a protected classes. Gay men are perfectly capable of being monogamous, and avoiding high-risk sexual activity.
But yes, you are advocating that people have their rights infringed upon, when you advocate for a vaccine mandate. And worse, you're being blatantly inconsistent, based on shallow ideological considerations.
Apparently virtue signalling as a supporter of gay rights, or supporter of the obese, is more important for vaccine mandate supporters than minimizing the costs that irresponsible behavior burdens society with. Or maybe minimizing the costs of irresponsibility isn't the real motivation at all - the real motivation is persecuting anti-vaxxer MAGA types, under the pretense of holding people responsible for the costs they burden society with.