ALL ABOUT ME

Why is it that some people always turn everything around to make whatever the subject is "All About Them"?  I don't get it . . . .  I suppose you could say they are very selfish and self center which I would think would be true.  Especially when you are telling them about a family member being hospitalized because of a recent emergency surgery and they say "oh that's no big deal, I had that happen to me years ago"  Really?  No concern or sympathy just turning it around to put the focus on themselves.  I just don't understand people sometimes.  Granted we should put ourselves first in some instances, but we should also have compassion for others occasionally too.