I really didn't understand a Jehovah's Witness I ran into at the hospital, could another witness explain?

We got to talking, he said he'd never been in one before and then I told him that I had been there more times than I could count and I started recounting some of my stories. When I got to the part where I had to have a blood transfusion which came directly from my father he backed away, he told me that I was tainted and that my Dad was evil and he should have just let me die. Huh?