This thread made me think of something I hesitated to post, because it sounds so 1970s touchy-feely, which it is, and because I can't explain it well. One day when I was a teenager, I heard a speaker on PBS (I think he was known as the Love Doctor or something) talk about "lovers and haters," the latter not the Jerry Springer usage. I don't remember exactly how he framed it, but he said that too often the lovers let the haters control them. So, if you're walking down the street and you say "hello" to everyone you see and give them a big smile, you keep doing it if you get back smiles and hellos. But if someone is mean to you, and you don't greet the next stranger, you've let the "hater" control you.
I'm not saying it well, and it's pretty basic, but it stuck with me and truly has made a huge difference in how I live. If someone snaps at me or tries to make me feel bad about something, it doesn't work. If I smile at eight people, and they all snarl at me, I'm going to keep smiling. If someone tries to hurt my feelings, it's rarely going to work. As I said earlier, being disabled has made my life a pretty constant reminder of how wonderful most people are, but every so often, I run into someone who thinks people with physical challenges should just stay home so we don't inconvenience them (and I do my absolute best to avoid being in the way or holding up a line). All they are to me is the exception that proves the rule.