You're quite mixed up there.
If a person has HIV, then the virus exists in the majority of their bodily fluids.
However, the HIV virus is very weak, and so someone without it can have as much contact with those fluids as they like, even ingest it, and not catch the virus, as it'll die before it can do anything,
unless the fluid in question ends up in
their blood, at which point the virus in the conditions it needs to survive and propagate.
So, yes, blood is involved, but it's the blood of the person
without the virus that matters, not the blood of the person with the virus.
Please learn the actual theory behind something before you try to correct someone.
You may wish to ensure that you yourself have everything straight before you say things like that in future. Otherwise it can reflect badly upon you.