The instant I read his answer, I knew that he was referring to his own experiences dealing with fan backlash that stemmed back from the initial reveal for TFA.
I know its easy to forget that he went through an absolute fuck ton of BS for being a potential black main-character, the star of the sequel trilogy, and a black stormtrooper. But, he did. If anyone is going to ask him about fan harassment, I would imagine he would go to his own first-hand experience and what he did, rather than project what someone else should do onto their experience.