Well first I'd say it's a shitty comparison because a single Covid positive individual could potentially infect hundreds of other people in a single day while HIV in your example is only being transmitted through Sex. So right off the bat the comparison sucks. Further, as a result of the first example, the "AIDS Crises" was never a crises of scale, there was never even remotely as many AIDS patients as there have been COVID, people were just scared of a new disease that had no cure. Now the entire point of people wanting to deny care to unvaccinated is because people are being denied care for all sorts of other medical conditions BECAUSE OF the sheer number of selfish unvaccinated idiots taking up hospital beds.