The world has no use for sick people.
You think people are your friends, but some people's idea of friends is someone to go out and do stuff with. If you get sick and can no longer go out and do stuff, then people have no more use for you.
Some people do still talk to you and help you when you're sick. Mostly they view you as a charity case. They talk to you because they feel sorry for you, not because they desire your company, because you have inspiring ideas, because you are funny and fun. When you are sick, people assume that you have nothing to offer.
Several people, both family and friends, told me that family are the only ones who stick with you through illness and bad times. That does seem to be a trend. Family is kind of stuck with you, whereas friendship is more of a voluntary relationship. But it's not an absolute. There are certainly plenty of people who don't stick with their relatives, and plenty who do stick with their friends.
Meisha is a good friend because she knows what it's like to be sick, and she views friends as people who help each other, not just people to go out and do things with.
When I had mono, I was thinking I don't want to waste any more time on fair weather friends. But when I got better, I wished I knew someone who wanted to go kayaking with me. So maybe there's a place for fair weather friends, because sometimes it is fair weather and you want someone to do fair weather things with. But maybe it's better to do things like that with a group like the Adirondack Mountain Club, because then you know hiking and kayaking is what they are there for and they won't be there for other stuff. If you just do it with individual people, you might be lured into thinking they are your friends.
I met a woman last month who was talking about how she wanted to meet the kind of friends who would help her when she was sick. That's the kind of friend I want to be and to have, but I didn't want to be friends with her. In order to be friends with someone, you have to like who they are too.