Fallacy of relative privation
https://tvtropes.org/pmwiki/pmwiki.php/Main/AppealToWorseProblems
The "Children Are Starving In Africa!" Argument.
Arguing that expressing concern about a (relatively) small problem means that the person doesn't care about any larger problems. The fallacy can be thought of as a combination of False Dichotomy, Strawman and Red Herring, taking the opponent's claim and appends to it the following additional claims:
That it is not possible to care about several big and small problems simultaneously. (False Dilemma) That venting a minor complaint is an assertion that that the major problem is considered unimportant. (Strawman / Red Herring)