If someone is mentally ill such that it's obvious to folks around them, and they communicate poorly compared to another candidate who is in other ways equal, then is it discrimination not to hire them? (not saying this description applies to anyone here; I'm just asking a hypothetical to get a sense of what's meant by discrimination)
If you interview a person and say to yourself, "This guy is kind of strange. I'm not sure he'll pick up on social cues, so he might make people in the office uncomfortable. Sometimes he doesn't communicate well. He can't explain what he's thinking, and his words are a jumble. I'm not sure he could publicly speak, like give a presentation, and I sure wouldn't want him to represent my company to customers." Is it discrimination to pass and choose another candidate who is comparable in other ways, and not hindered in those communication and interpersonal ways?