For those with a chronic illness it's common to wonder "What's wrong with me?" Or, "Why don't people like me?" When the reality is that grown adults can't deal with illness as a part of life. The ill person is blamed and shunned, and the healthy normies go about their lives. Probably none of this behavior even registers consciously. And that makes it hurt even more.
I lost a friend today, someone whose friendship I greatly valued. I don't know why, she just dumped me. I'd hoped that being a pretty awesome person, and kind and thoughtful, would count for something. It doesn't, though. Sometimes it's a crying shame that humans are hard-wired to be social.