I don't have to give a reason to not-rent-to-someone and if I *want* to give a reason, "doubt about their ability to pay the rent" is a fine one. If I decided I wasn't going to rent to complete fucktards, half of my apartments would be empty. (That'd be about ten grand a month in lost income. For ten grand a month, I can tolerate a lot of fucktardosity. Also, the people who broke their toilet in a feat of stupidity pay their rent like clockwork. Most of my tenants, even the dumb ones, manage that much.)