interpretation of the Russian dictionary

Hello, today posted a photo to the server (copy attached) and signed it "Negro" .Moy post immediately removed and was told that I break the rules diskorda.mne interesting to know what the rules I break, if I: did not oppress, persecute, showed disrespect and did not call for anything. According to the definition of the Great Russian Encyclopedia, the Russian word "negroes" defines only representatives of the Negro race, not the Negroid in general. source: https://ru.wikipedia.org/wiki/Негр#История
if I still broke the rules, then tell me which one and attach a link to it