Well, I totally agree with that. Personally, I think this awareness makes more sense in the means of appreciating what you have: for example, when someone's life looks bad, they might think, "Okay, but I have enough food to eat. Not everyone is so lucky", - which might make them feel better. Similarly, a parent regularly reading to their children might think, "I am doing a very good job; not every parent can be as devoted as I am". Which, of course, is the exact opposite of guilt and feeling bad.
The professor is not a very good one, in my opinion, both if he meant what he said, or if he didn't express his thoughts properly.