I hate saying this because I try really hard not to judge this kind of thing, but Asshole Mario didn't really need a preachy message. Especially not one that gets fumbled this hard.
Being frustrated with a disability and the difficulties that come with it is not the same as being so incompetent you'd kill yourself by accident. Real disabilities mean finding ways to cope, finding ways to get around the problems you can't wholly avoid, not forcing yourself to do things the able-bodied way no matter how difficult they are.
I gave up on playing this because, having a disability myself, I didn't really appreciate having a game tell me that it's wrong for people to say I'm a useless, incompetent burden when I am actually playing a useless, incompetent burden.