As someone with a brain injury, I am considered "neurologically ill" and so this kinda stings. Part of my brain has been cauterized off. The resulting damage has degraded my ability to exercise over the past 5 years. I am completely honest about my surgery and motives for having it. I think it is awful to put down a whole group of people because of the actions of a few.
That being said, lying about it is distasteful but some people are ashamed I think. It's up to us to help end the stigma of any if these procedures by being honest and answering questions.