We are blessed to have people in our lives on whom we can always depend to be there for us. We try to be that to them as well. Right?

Then there are those whom you wouldn't even ask for the time of day. You might get "what's it to you? Get your own watch!"

Seriously. Can you always spot them? The ones who are unavailable for human decency and normal interactions? Do you have some inner waning system that protects you against them? If so what?