This isn't in dispute. The two main schools of AIDS denialism say:
HIV exists but doesn't cause AIDS; Peter Duesberg from UC Berkeley argues this
HIV isn't real, hasn't been isolated. Perth Group argues this
But both say something like AIDS exists and caused by gh*ey lifestyle
HIV is very real, or at least something like GRIDS is very real. I see people with it all the time, they are gay in the vast majority of cases.