The right in Weimar Germany would have more ammunition for attacking the decadence of the Weimar republic for one.
It took some time for them to figure out what AIDS was caused by OTL. It was spreading in the late 70s and it wasn't until the start of the 80s that they figured out how it was transmitted and the first ideas about the disease and how it was transmitted OTL were wrong.
Well, the POD might include the virus mutating earlier and emerging from Africa earlier as well.Almost literally impossible. Travel was too restricted, the "sexual revolution" and blood transfusion (especially the sort related to hemophilia) was vastly different, IV drug use was relatively rare, and probably most critically, the virus itself hadn't mutated. This is demonstrable by the fact that there were isolated cases from the 1930s that were identified once the mechanism of the disease was identified. Moreover, as already noted, the ability to identify viral agents was almost nonexistent.
If there was any impact it would be some level of even greater discrimination against the Gay community since the disease would be concentrated in that community.