I know how you feel. We are in the process of weeding out the bad eggs. My daughter was diagnosed 3 months ago and I still cry a lot. It makes people uncomfortable, but I feel like if they really cared about us they could spend a little time educating themselves and I wouldn't have to teach CF ed. 101 everytime someone comes over. Yes, it helps to talk about it, and I want to educate people, but if someone I cared about was diagnosed with something I didn't know much about I would read up on it.
I had a cousin call and ask if she could come over for Thanksgiving w/ a cold. I felt really bad, but told her it wasn't a good idea. She then called back a little while later and asked "if we could just set up a quarentine table somewhere." I couldn't even speak, I started to cry out of frustration and handed the phone over to my husband.
One things for sure, our circle is changing but the people left in it are truely wonderful.