Yes I understand that she is upset that somebody from her past/personal life is being brought up as an example of a terrible person, who she perhaps has nice memories of and that’s stirring things up.
However he did those unacceptable things which made this a bad place to be. Continually for years and thought he was clever and funny for doing it. And people excused and allowed him, and it was all ok because he was their pal in real life.
I can’t hide that and shut up about it, even if it’s upsetting and uncomfortable for people who saw the nice side of him.