Is this homophobia or just a friend crossing the line ?

One of my friends is a Medical School dropout, anyway we have been friends for over 12 years (being 23 thats a while) he was one of the first people to know that I am a homosexual.

Anyway we were in the pub the other day and he went on about the stuff he read about gay people in medical school, how the level of risk is "huge" for a gay guy and he is guess I am a bottom (he is right btw) since we had a coming out party at the gay bar a while back I got drunk and twirked with my boyfriend, we disappeared and we weren't seen until later when we were found asleep in a bed together....

But he went on about HIV and stuff (I am well aware of it and get tested etc.) but still it was a bit much

Its the 3rd time he has gone on about it in a short while . He seems to think he is a doctor even though he got nowhere close (Ironically being a PhD student I am going to be the Dr) . I sometimes think he is looking out for me or something, he did save my life in a way when I was deeply depressed, self harming and suicidal and dragged me to the drop in centre at 11pm but still its a bit much this whole STD thing