My 23 year old adult brother pees on the floor and blames his adhd - r/badroommates

Apparently he doesn't "see" tasks that don't create dopamine - which, seemingly, cleaning up his urine, putting the stacks of dirty dishes in the kitchen in the dishwasher, cleaning away the food he leaves all over the kitchen surfaces, and not stealing my or my parents liquor just don't produce. It is all symptomatic of a lack of respect but apparently it's actually because of his ADHD, which he's been medicated for for at least a year now (for what purpose if it helps so little?). My parents are at their wits end because he just doesn't listen or care, and my mum just says ADHD presents differently in boys than girls when I highlight that I've had (female) housemates with ADHD before and they were never anywhere near this bad. I think deep down, they know it's just an excuse for him, but mum in particular struggles to accept this.