I have personally found NZ very welcoming of same sex couples, so I do not think the grounds are in any way based on that.
While not an expert on the subject, I would imagine one of the major reasons is that if your friend was coming over on the basis of a work permit, or as a skilled immigrant, and it was seen that HIV may have an effect on his health in the future affecting his ability to work, this may have resulted in not be granted a visa. Plus the health care issues.
I wouldnt say it was in any way discriminatory, as MotherBear said, HIV can affect anyone.
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