As an example the percentage of people with HIV has increased in Austin, Texas by 41% or so from 2006 to 2012.
1 - Austin population has grown by 15% in that time
2 - A proportion of those people with HIV will be heterosexual
3 - Between 1990 and 2010 the number of same-sex couples in Austin grew at a rate of three times the city population growth rate. Yep, Austin got more gay.
Add those three together and I'd say it's rather likely that the extent of HIV infection in the gay community in Austin has probably dropped, thus entirely fucking disproving the ignorant shit you were claiming.