A
person who genuinely and seriously calls out somebody's legitimate complaint as a first world problem as a means of trivialising them and their complaint, usually to obtain a
smug sense of moral superiority because of how 'in
touch' they are with the 'plight of the underprivileged'.
Dave: "Great, my air conditioner just died in the middle of a heatwave! This sucks."
Twat: "This is such a first world problem. At least you have a house and clothes, and perpetual access to the
internet on your smartphone to make these status updates."
Dave: "Don't be such a first world
twat."