I think those of you with parents from China are encountering this because I think in your parent's China, these types of issues boiled down to one of two things. You either can work, or can't work.
If you can work, then they don't understand what the problem is because you can do what is necessary to live. If you can't work, then, as the other person state, you must either be too stupid, or too crazy.
Your parents deeming you stupid seems to be their best attempt to show you compassion.
If you first made clear that you can work and eliminate that from the equation, and make it clear that you are not asking for accommodations from them and that you are just trying to explain to them why you are so strange, perhaps they would understand better.