Husband says I don't care about his autistic son

My step son is 12 and autistic. He also wets his bed. He lives with us and his father never washes his sheets. I work 60+ hours a week and have to come home and wash his sheets. He shares a room with my 10 year old and he's mad because the whole room smells like pee. He's been to the doctor and he's fine. I know people will say wake him up but I work 60 hours a week with only Sundays off... I need my sleep.. I'm never mean about it but I recommended getting him goodnites bedwetting pull ups. My husband was so against it. My husband is also on the spectrum and wet his bed until he was 20 and his family abused him and used diapers as a punishment. I'm not trying to do that. His son is also having skin irritation from his sleeping in his own pee. I talked to his son about goodnites and told Jim he can even pick out the ones he likes, like transformers or camo. Being able to pick them out excited him. He wanted the girl ones because he likes pink and butterflies lol. Now we can order him a new bed and everyone can be happy but my husband is pissed and said I don't Cate about his son. I do! I really do...

Edit: I do think this may just be bringing up bad memories. He might feel like its a repeat of his childhood. I'm gonna let him calm down and talk to him and reassure I care so much