It seems the GP's point was that you can be drunk, unshowered, and yelling at home, and nobody cares. It's when you don't have a home that it is seen as an issue.
A homeless person could be drunk, unshowered, and yelling out in the woods by themselves and no one would care. It's the drunk, unsanitary, and loosely coupled with reality around other people that is a problem. No one cares about these things unless there's a chance it's going to turn into violence or a public health/sanitation issue.
