I think everybody has bounderies. Bounderies to what they feel is socially acceptable and what isn't. In my experience I believe most people are kind people who have their bounderies pushed back pretty far. I think one boundery for a lot of people is when somebody does something that hurts another person. That would be something that they would object against or dislike you for. Other than that, anything overly strange might invoke some curiousity but I doubt there'd be any contempt. So as long as you're not hurting anybody else I think most people will let you be.
the problem is, often people with disorders, in their passivity or silence or personal behaviours, inadvertently hurt other people without meaning to. For example, just knowing that you are not happy, can cause some people discomfort. And sometimes I think people with disorders can behave in ways that others don't know how to deal with and they find this confusion uncomfortable. Just being different sometimes can cause others unease. [but that may not always be a bad thing!].
But I think it boils down to how accepting other people are and also how secure in themselves they are. If a person is not secure in themselves, when confronted with a disordered person they're more likely to choose reactions such as anger or hatred or superiority rather than compassion and empathy and concern. Because to choose the former you can protect your ego and hold on to the stance that you are right and they are wrong, whereas choosing the latter would mean letting some of their burden fall on your own shoulders. To have compassion, empathy and concern for another person means feeling their pain, which most people would rather avoid. But to have anger, hatred and superiority means that you can feel that you are right and they are wrong which will make you feel good about yourself, that you are in the moral right.[......i think?!!!...just my opinion!]
but anyway, in conclusion I think people without these disorders will find it very hard to understand people with these disorders, and I think, while most people will be happy to just let you be, I think it'd be rare to find people that have geniune empathy for us. I think most people will feel superior to us.
and in answer to your second question, I think anybody that has experienced any kind of humbling problem in life would likely accept you as a friend, regardless of what that problem may be, but they may not fully understand you. People who have been through what you've been through would both accept you and understand you. But as for those that don't know what it's like to be humbled to the same degree as you, if they're not secure people, may not accept you.
p.s. I just read back through my post and it seems a touch cold.....I've made lots of friends in the past that are totally different to me. I get on with my sisters better than anyone else in the world and they're still too young to have experienced anything of hugely humbling proportions. Plus, I know for me, if I ever met someone, even if they were really messed up, I really strongly like to believe that I would not only accept them but I would attempt to understand them and would have love and compassion for them too.....er....so in conclusion....well i'm not sure what the conclusion is?!?!?.....I'm just babbling again!