I'd be so so so careful not to judge someone 'not disabled' using a toilet. There are too many reasons to write but they could in fact need the disabled toilet.
But, isn't the disabled toilet meant for people with physical disabilities? That's why the only thing that makes it different than the regular toilets is the railing and the space (for wheelchair etc)

I would have thought that if you don't have a physical disability you would just use the regular toilet?

ETA: Oh I see, I just saw LuLu's post!