Possible brief visit(s) to Switzerland once or so aside, it appears less likely you've ever been in the former Yugoslavia during or after Serbia's recent nationalist, ethnic, and religious genocide.
Given Serbia's genocide-diminished diversity, few non-racist Serbians, part Serbians, or people of much if any intellectual depth would even jokingly criticize Switzerland's relatively low albeit growing population of "black people" (your words). Serbia?
Yes, only about 5% of Switzerland's residents are from Africa or descended of African parents or grandparents. Setting aside Swiss ethnic diversity quadrupled the last three decades from a small %, another percent+ are of more distant African or other darker genetic skin tone backgrounds from other non-African nations. Serbia? Not nearly so much, slobodan!
With Los Ticos out in Group E, no additional compelling reasons are really required to root for Brazil and Switzerland to advance and the
White Eagles' expedited return to Belgrade. Иди кући, Слободана!