Well, one of the main differences between disabled and non disabled is the fact that barring very generous relatives or a huge lottery win, housing benefit is the only real option for housing available to those too disabled to work. Non disabled people can work, but many choose not to, they treat the dole as a lifestyle choice. On that fact alone, I would class them undesirable to have as tenants.
Obviously, there may be cases of non desirable disabled people, but on the whole, when it comes to parties, loud music, trashing the place, unpaid rent and general ASB, you’re far more likely to get problems from healthy individuals, those who choose the dole as a lifestyle choice.
And no, I don’t think it’s discriminatory to separate disabled people from non disabled. The former have no choice in many aspects of their lives, the latter do, but sadly, too many are too lazy to get off their arses and do anything about their situation.