There also seems to be some miscommunication in this thread about the distinction between feeling sad that someone has HIV, vs. feeling sad that someone has to carry the emotional weight of HIV with them. Many people still experience the stigma of HIV, being seen as "unclean," the emotional labor of having to constantly reassure people that they're undetectable - especially when that's compounded by racism, homophobia, etc. If Billy Porter (or anyone) has experienced these hardships, that's probably worth feeling sad about. But there's a difference between feeling sad about those things / feeling sad for those who still suffer physically, vs. just feelings generally sad that someone has HIV regardless of their viral load or access to effective medicine.
It's not that there's no cause for sadness in any circumstance, but it's important to be conscious, clear, and deliberate about how/where that sadness is directed, so as to not inadvertently contribute to the very stigma you're trying to denounce.
I really think people in this thread are more in agreement than they realize. There is just nuance being lost in generalizations and miscommunication.