The transplant question always gets me. When am I having it?! Are you kidding?! Especially when it's by health care professionals. You'd think out of everyone, they'd know better.
I was healthy growing up, so I never really had to worry about other kids thinking they'd "catch" my CF. I barely even coughed, except for treatment times. As for the SSD, I've had other family members make comments about how they wished they could claim their SS now too. I try to let that roll off my back and be thankful that I CAN claim it.
It all comes down to people are ignorant of what they say... Prime example is "But you don't look sick..." It's all about the spoons people.