It's not just about that user, but other people who see the comments and believe that user's misrepresentation of the facts.
You were the one saying that you take PrEP to feel more comfortable having sex with people you do not know so well, or in sex parties.
Your argument that gay people are so marginalised that ephemeral sexual encounters are the only form of community or socialisation they have simply does not hold with a very cursory interaction with the gay community, whether that be in person or online.