Is that right? Did you really say that?

I told my dad I had breast cancer first, then my sister.  She said "Is that the official diagnosis?"  I said yes, I needed surgery, chemo and radiation. She said, "Well, the chemo and radiation are going to kill you anyway."  I didn't say anything but the next day she said she wanted to apologise as she MAY have said the wrong thing! Possibly!
I quite liked the response from a 'friend' whose brother I had been dating:  "Maybe it's best you just stay friends with X as he's already had one wife die on him."!!!  I said I didn't intend to die.  Didn't say I wan't intending to get married either!  That friendship has sailed!