I've started this particular topic several times but haven't like what I'd written. So, I'll give an example. I tripped over something once and just fell flat out. Brother just laughed and laughed. He never once had the thought that I could've been hurt. He just thought it was funny. Now, don't get me wrong, I'm sure it did look funny but my girls were sufficiently worried to ask if I was hurt.
He is learning, but this one of those things that he has to force himself to think about. He has to file away all of these events in his life and retrieve the proper responses that fit each particular situation. If he's never encountered something, he will be at a loss.
That is not to say he doesn't have feelings. He does and strong ones at that. He cried when I left his this past weekend. He even called me on his own. In the end, after a promise to go buy gum, he rallied.