It's worth noting that multiple outbreaks in several countries at the same time in gay communities without all of them attending the same parties should be such a rare occurrence other options should be considered.
Consider a hypothetical autocratic regime with a history of criminalizing sexuality, committing human rights violations, and researching biological weapons. If their military felt it was time to deploy an airborne virus within enemy population centers, wouldn’t it make sense to do so simultaneously? And why wouldn’t this regime release it in a class of location that create plausible deniability, maligns a population historically persecuted by the regime, and foments societal conflict in the enemy?
Personally, given the implications, I’m hoping this warfare proves to be more informational than biological.