HIV transmission is partially related to attributes that are correlated with sexual orientation, the most prominent of which is the fact that the chance of transmission is much higher for anal sex than it is for vaginal sex.
Which all goes back to teh point: HIV transmission isn't related to sexual orientation, even if some sex acts are traditionally attributed to one specific sort of orientation.
I’m bi, and hiv is a big deal in the gay community. I know people who have it, we have clinics around dedicated to treating people with it. Straight people can do anal, straight people can get it otherwise, but this is hitting gay/bi men way harder. It’s okay to acknowledge that