Several genocides happened in Africa so he could be referring to one of them (Rwanda genocide as mentioned next to this comment is well known, recent genocide i

Several genocides happened in Africa so he could be referring to one of them (Rwanda genocide as mentioned next to this comment is well known, recent genocide in CAR and so on) or all of them in general. Most western people are mainly familiar with Holocaust as the big example of genocide but there have been several comparable horrific events across continents (Africa, Asia and I think also South America).