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Your going to clash. Bottom line because his hoarding is just different type OCD. I am ADHD and OCD. My mother is a perfectionist OCD type and we clashed horribly and she could yell at me and go off on me all she wanted but my brain just wasn’t getting it. I didn’t know I had ADHD at the time. I knew I didn’t want to upset anyone and wished I could just do and be what made her happy which is basically a house you could eat off the floors so clean. I never measured up and who knows maybe that just created nothing but conflict. Your OCD is more acceptable in our society. His OCD comes with a lot of stigma. So, all I can say is getting upset and angry at him isn’t going to do anything but make it worst.