Selfish?

Here's a thought I had tonight at work. When someone asks you how you are, is it selfish not to ask how they are doing? Or is it ok to just answer and be glad someone cared? Or when someone tells you that you look nice. Like, a few weeks ago at church, someone said I looked really sharp in the suit I was wearing. I said "thanks" and the person looked at me and said "well, I guess I don't". Was I wrong in just being glad someone said something to me? That doesn't happen to me a lot, so I was just glad it happened. Or on the other side, is it selfish to expect a reply when you ask someone how they are doing? I really can't decided how I feel about that... opinions anyone?