My Brother Doesn't Understand What Misophonia Feels Like

TL:DR. I have really bad misophonia with almost anything you could think of. Chewing sounds, slurping, mouse clicking, keyboard typing, snoring, hard objects falling on each other, my dog whining, pets lapping water, and so many more. And I'm lucky to have parents that are always really, really supportive of it. They always go as far away as possible from me when they're eating, and if we're in the car or something and I ask them to stop eating or drinking they will. They never get mad at me, which is so amazing. But my brother does. He thinks it's unfair that he can't ever be around me. When I ask him to go in another room, he goes an inch through the doorway that's like five feet from me. Of course he loves me and doesn't want me to suffer, but I don't think he really gets how much despair I feel when I have to listen to people eat, or even know they're eating near me while I'm plugging my ears. No matter how much I tell him, he just gets upset with me. And I don't want to hurt him, so I always say that, but it feels like the more I try and explain, the more he gets upset. I don't know what to do because it's just been getting worse lately and I've been getting triggered a lot, especially by him crunching on ice almost 24/7. Does anyone get this and have advice on what I should do?