Yeah, I don't know why she said that. In the same comment, she also shared that she somewhat recently found out her biological father was a perpetrator (not against her, but many other children), along with discussing how she suspects he was victimized. I think her generalization may be an attempt to humanize him and make things easier to process, but I don't know.
I was pretty upset though, because I had just got done sharing how angry I was at my abusers--this was one of the first times I was able to openly express this anger--and she responded with this. I just felt like it was an unhelpful and unnecessary comment in that moment. Also, I'm still a kid in high school, and everything is already really hard for me to wrap my head around, and this just made it a lot more complicated and confusing for me.