My understanding is that, often, on MN, someone will post, "My MIL is getting on my nerves because she keeps feeding my DC proscuitto when we are vegetarian" and someone will retort: "first world problem" with the subtext that, "your DC are being looked after by a loving relative and fed decent, even luxurious food and here you are, whinging! think about children in Africa who are starving".
But that "FWP" retort serves only to reinforce the stereotype that people in the developing world are:
a) all starving
b) don't have the usual worries about MILs and DC and what they will and won't eat and all the rest of the minutiae.
Yes, if you are living in the Democratic Republic of Congo, then of course, infant mortality and adequate nutrition for your children is likely to be high on your list of fears. But that's not to say you don't get pissed off when small things go wrong or your MIL does something annoying, because people in the developing world are first human beings with all the complex emotional inner life we all have and people living in a struggling nation.
It reminds me of the story of the concentration camp survivor who emerged from the camps feeling he would never complain about the mundane ever again, just be grateful for ever day, every minute. But within a few months he was grumbling about poor plumbing in his flat and being given a table by the loos in a café. That's because he was a normal man with irritations and desires and needs, even though he had been in a camp.
This chap on Twitter is trying to highlight that people in Africa (and elsewhere) experience the same range of emotions and get upset about the same crap people in Europe do, even when facing more dramatic situations in the big picture. It's a way of reminding us Africans are not all noble, sad, pitiful creatures, starving and wasting away.