I don't really fault people for being uncomfortable around someone with HIV, and certainly not their choice to avoid sexual contact. Neither does the video you showed. It's just saying don't be a dick about it. Don't call someone gross.
And I would say someone who has AIDS and doesn't tell the person up front is a piece of shit. But these are posts that attack people who were honest about it. There are safe ways to have sex with AIDS, so why shouldn't these people find someone who's willing to put up with the hassle?
There are
https://www.avert.org/living-with-hiv/health-wellbeing/being-young-positive
Safe ways
http://www.aidsinfonet.org/fact_sheets/view/151
To have sex
http://www.everydayhealth.com/hiv-aids/hiv-sexual-intimacy.aspx
With AIDS
http://www.thebody.com/Forums/AIDS/SafeSex/Q181039.html
It's sad that you couldn't take a few seconds to actually look into the validity of a statement that contradicted your beliefs on the matter.
Thanks for the heads up, I'll check it out when I have a few minutes.