> First, I am not a single data point.
You most certainly are. Cystic Fibrosis is not a communicable disease caused by germs, it is a genetically linked ailment.
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001167/
A quote: "Cystic fibrosis is a disease passed down through families that causes thick, sticky mucus to build up in the lungs, digestive tract, and other areas of the body. It is one of the most common chronic lung diseases in children and young adults. It is a life-threatening disorder."
> My oldest son has the same diagnosis, my youngest son is a carrier and by living with me they were both exposed to the same germs.
They weren't exposed to the same "germs", they were both exposed to you. This is Munchausen by Proxy.
> ... doctor's routinely dismiss people with CF and write them off.
False, absolutely false. You were dismissed, not because you have CF, but because you're mentally ill.
> ... let me suggest you have no idea what you are talking about.
Which of us tried to claim that CF is transmitted by germs?