I hope this guy has some disinterested witnesses to all of this, otherwise he's screwed. The hospital staff will not implicate itself, so he's on his own.
They might confirm he was being disruptive and belligerent. Perhaps he and his partner's family don't get along and he started a blazing row with them and failed to simmer down when asked to do so by the staff. Just a thought.
I had the same thought, and theantijock suggested a similar scenario. But that's the point - who knows? This could be hospital CYA. But I do know that families can be viciously anti-gay.
When my late husband's former partner contracted AIDS (from cheating, and infected his partner, my future husband), the partner's family was nowhere to be seen. They offered no help. So my future husband bore all the medical expenses, going bankrupt, and took care of him alone. Not a penny came from the family.
But when the partner was dying the family appeared at the Texas hospital, expelled my partner, and took possession of the body. They made the funeral arrangements, that specifically excluded the partner, now claiming that he was the one who caused the AIDS, and had killed their relative.
A few weeks later my future partner came home to find a moving van at his rented house. His late partner's mother was there with a court order, giving her the right to take everything from the residence. Things they jointly owned were not differentiated, nor even personal items belonging to my future partner. She took it all, except for a few articles of clothing, and also terminated the lease.
My partner had no place to stay, with not even a bed. He went to a motel, and then rented a place. He was living there when I first met him, with little furnishings. I met his Houston friends, who confirmed this horrific story, having known both of them.
Sometimes we think we know our partner's family, all cordial & nice. But should he become seriously ill or die, be prepared for a Jekyll & Hyde change. Make sure your legal rights cannot be denied you, in writing. In most US States his blood relatives will supersede you in everything, unless you have ironclad legal documents to protect you.