Be surprised a word used so casually towards your group and other races starts to get used by other races brehs. But really, this is a self inflicted wound. The amount of times i have seen black people say nikka in front of non black people, especially addressing them, is uncountable.
Will be the only black person around and cant go 5-10 seconds without saying it. Especially all of the insert ethnic group + nikka combos (Mexican nikka, Chinese nikka, etc....) or in general (Worker nikka, boss nikka, chef nikka, singer nikka, nerd nikka etc...). Will say it incessantly with non black people, even call them "nikka" and then either "allow" them to say it or get angry if they do.