Hi Ophelia! Nice to see you here, I'm sorry you are going through this with your brother.
This is just my thought process. He has done this for years. Whatever you say is not likely to change his actions, so is there any point? I too suffer with anxiety. I find when I work my anxiety is lower due to being able to refocus. However, not everyone is the same. It amazes me how many people tell me (in the course of my work I have to ask occupation), they are on disability. It's the most abused system out there.
Hugs to you. I agree that NO is a complete sentence.
Come here to get support anytime!