Last sentence of the article;
Robertson-Stewart says what he regrets most is how this incident will affect future victims of racism on campus. “Who’s going to believe that racism actually happens there now?”
There probably ISN’T going to be any racism, except, as this incident shows, from your side.
Maybe there won't be any future victims of racism at that university. He just takes it for granted that there will be. After all, that is a given if any of the students are white.