It is probably the last minority group that can still be discriminated against I think, mainly because disability isn't something that many people want to think about.
We are also socially conditioned to look away or think 'ill' of those scarred up, deformed, different...
Think back to when you were a child, you probably stared at someone in a wheelchair, or disabled in some way and your parents (being kind) would say stop staring, look away.
What people should be saying is 'if you are going to stare, say hello'
I remember way over 10 or more years ago I had my stick, I was in a queue, tried to move and for some reason couldn't. I looked down and a little girl was hugging the stick!!!!!!!! The mom was mortified, I thought it brilliant and laughed. Her initial reaction was get off, leave the poor man alone.
No, say hi to the man (not a poor man) etc.
Plus think back to the cartoons, batman and robin, disney films etc etc. Most badies are disfigured.. Blimey, even The Lion King, the evil uncle is called Scar.
End of ramble.