Didn’t even know
We do not know what’s sad in this story, the fact that this person was bullied in high school or that they didn’t even realize it until twenty years later. How can you not know that you were being bullied at school? Didn’t you see it happen in front of you?
We guess that all the bullying that went down here was probably behind her back and she really had no idea about it. That would make the most sense because everyone knows who is being nice and who isn’t, they are blind or deaf. Well, it was twenty years ago, so it’s over now.