I think you are protected under the law by the EEOC. They ask no on job applications if you have a mental illness. So I’m guessing they are cracking down on discrimination against this kind of thing. Maybe you should casually mention that to your supervisor, next step is HR which can be useless, but you need follow the chain of command. If nothing gets resolved you can file a complaint with the EEOC or even contact a lawyer. Lots of people knit or do something with their hands to help with focus. I’m guessing you already explained that. It could be your sup has ADHD to but is really sensitive to access talking and noises, maybe it floods his sensory system and makes him agitated. Or maybe they are just a jerk. Jerks do exist, I think it’s a category in the DSM.