Here's one of my very few rules.
Bar me from commenting on your journal and I defriend you. Tell me I am patronizing you by disagreeing with your traumadrama in as level-headed a way as I can manage and I will defriend you. Act in a way that is self-indulgently divisive of a community I care about and I will defriend you. Elevate your gut feelings above other people's and then turn around and accuse me of bullying you when I point this out, and accuse me of calling you a bully when I have taken great care to do no such thing, and have simply at all times called for dialogue, and I will defriend you.
Some people just are not worth the time.