I give you credit for trying to be a peacemaker but it’s so hard on social media, especially if the parties have no real world interaction. It’s like trying to break up a dog fight. You’re going to get bit by someone.
I also think it’s difficult to trust anyone enough with what limited interaction we enjoy on the internet, to open yourself up to admitting that we are wrong. There is very little upside, and there is a very real possibility that this is will further encourage the aggressor.
I’m sorry for you in this matter. I don’t even bother anymore.