another day in the office 4

Here I would like to talk about the lamest excuse I ever have heard. When I start to complain about something, some mishaps or obstacles in my way, some people answer: "Ya know, there are some people who live in the street and have nothing to eat. You should be happy that you are not one of them."
I heard this expression many times from people from different countries. Honestly, I do not find this comparison reasonable. People do not compare the economy of the United States and the economy of Ethiopia. Nobody tells: " Ya know, what crisis over there? We are happy with our unemployment money, especially in comparison with people from Ethiopia".
Also people who tell the stuff like that do not really know how much time and energy I spent to get the result I want. Are people living in the street work eleven hours a day? Are they ready to study five years? Are they ready not to date with anybody, because they have an assignment to finish?
Maybe people have approximately equal potential from the birth, but some of them invest more in their development and other invest less. And it is impossible to tell that 2 people over 20 can be equal. No, everybody gets what he deserves (with adjustments to good luck). Well, another problem is that people do not have equal opportunities. But it is a different problem. But anyway, I think that every normal person in long term is able to organize his life in a way not to live in the street and to have some food to eat.
So, the comparison with homeless and other people with mental issues always sounds offensive for me. And I am very surprise why people from different country use this lame excuse. Interesting, if all those people think alike? If yes, what kind of logic brought them to this inference?