"You're not going to contribute to the conversation anyway because you're so quiet."
/My group of best friends in elementary school consisted of three of us. Once we got to middle school, our friend circle expanded, but I remained a very shy person. My "best friend" would always sit next to me at the long lunch table, turning her back completely to me, while she faced the rest of the group and I sat on the end alone with her back in my face.
She would do this any time we were in a big group. Even at my own 13th birthday party. I had invited a bunch of kids I was too shy to actually talk to. Everyone sat in a cluster with their chairs to talk, and she stuck her chair right in front of mine to block me from the group.
One day, I finally got up the courage to tell her to stop doing this. I guess a tiny piece of me still believed that she wasn't aware of what she was doing, that my best friend couldn't be that unnecessarily cruel on purpose.
After I confronted her, she said, "I could stop doing it, but you're not going to contribute to the conversation anyway because you're so quiet, so it's pointless."
She never stopped.
We are grown up now and haven't seen or spoken to each other in decades. I am much stronger now, and have acknowledged that I never deserved to be a victim of her sadistic acts of micro-cruelty. And that she was a completely miserable human being.
But nevertheless, the way she made me feel during adolescence will always stick with me.