This is because the sort of person who loves to lecture about how their are children starving in Africa so I can't care about your problems holds the following untenable assumptions to be self-evident.
- "It is not possible to care about big and small problems simultaneously." This is horseshit because a Holly can be aware that there's a Great Big Problem she can't do much about no matter how much she might actually want to and a Tiny Little Problem that would go away on its own if Mom would get off her high horse and help her with it.
- "Venting a minor complaint is sufficient proof that the major problem is considered unimportant." This is a load of crap because of the reason I mentioned above.
- "If the person irritated over the minor problem did help solve or even cared about the big problems, s/he would then not mind at all that his/her car broke down or whatever the frustration was...or because there are people with worse problems, that person shouldn't complain about a frustration" This is simply an excuse people who are too lazy and selfish to care about the people in their immediate vicinity use to keep from having to do so.
The reason that I mention this is that there's a hidden postulate that is so obvious, people don't mention it. Science fiction author Isaac Asimov once referred to something like that as a sort of zeroth law because of its unspoken nature. What seems to underpin the need to bellow about starving orphan refugees in war zones dying of world diseases is something along the lines of
"0: "By invoking insoluble problems, the unsympathetic drone trying her damnedest to avoid caring about her child can hoodwink herself into thinking of herself as a paragon of virtue instead of as what she is: a cold-hearted solipsist sick with the mortal sin of Sloth."