I don't understand the "actual example" given (non-sarcastic quotation marks). Should I interpret it as the doctor only hiring nurses because he wants eye candy. I then still don't see why it would be justified firing someone over bullshit reasons... I mean, was it justified? Did the writer of that section think it was justified? It's not clear to me from the context.
One could also make the example a hypothetical one, like "a doctor who only hires female nurses because he thinks he has a chance of getting in their pants" is a good example of discrimination happening oppositely to how traditionally is expected. I feel like the example gives a lot of extra information that is irrelevant to the concept of reverse discrimination which only confuses.