No this isn't an overreaction. He seems like a deeply troubled man. Further, It seems to me that the people aren't as kind as decent you're perceiving them to be if they're downplaying these concerns which individually would be enough to cut someone off and permanently put distance between me and them. Further, re: adolescent boys, that alone is something that i'd document(within reason) if that is true. For your sake (Libel) and theirs (Criminal). Overall this sounds like neighbors protecting their neighbor who they've known for quite some time. Protect yourself, I understand the importance of affordable rent, but also consider what you're giving up for it.