If they are livable, they aren't derelict, yet. Ugly is one thing, but unless they are being illegally operated, a risk to navigation or the environment, or unsafe for the occupants, then it is just another ugly boat on the water that is none of my business.
Derelict and abandoned boats are a real problem in Puget Sound and it is costing the rest of money every time we renew our registration.
When you see a run down boat anchored in the same place for weeks or months at a time with people living on it, you can bet that it's not being visited by a pumpout boat every week or two and you can bet the occupants aren't carting their human waste to a disposal site. They are peeing and pooping in the water or dumping it at night. That's illegal.