Is OTHER wrong in the post ? POST : TLDR as a haiku: 

Brother has disease

Our bathroom is filled with shit

I don't like his shit

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So for context me \[18m\] and my brother \[21m\] still live at home with my parents. This means we have to share a bathroom as my parents end up claiming 2 of them (one for both of them and another for my mom who loves makeup). My brother is a complete slob when it comes to bathroom use and he never ends up cleaning so I have to do it because I hate having a dirty bathroom. even when i complain to him or my parents he never does it (he's a little bit of a favourite). But thats besides the point, my issue is that he was diagnosed with chron's disease (which is a bowel disease which basically makes your gut uncontrollable at times) for which he takes medication. 

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so anyways here's the real problem pepare for a bit of grossness (sorry). Evertime I go to our bathroom I have to clean off our toilet seat because somehow he gets faeces on it and who wants to sit or even look at that shit? (literally). Not only that but sometimes the faeces will end up around the toilet. Not only that but on one occassion he somehow got some on my pants in the laundry basket (low to the floor) which I then yelled at him for and got yelled at by my parents.

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In any case I complained to him first and he claimed it was out of his control and that he cant stop his problem. I was not to happy with the state of our bathroom and so I complained to my parents about it since he wasn't having any of it. They basically said the same thing of just try to accept it, he can't control it. I constantly get into fights with them about it because it happens non stop. 

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Am I the asshole for thinking that my 21 year old brother should be able to control himself a little bit more properly despite his condition especially since he takes medication for it?