It's one thing to decide that you don't want to associate with someone. That is normal, we don't get along with everyone... conflicts happen. I don't think we should be forced to interact with everyone we meet.
But quite another to suggest to isolate someone from a social platform where they have support. It really should be a last resort because it is so damaging to mental health. To our primitive minds, it is a death sentence because we wouldn't survive long without our community and support network.
Please consider this.
We are all humans. If I had been chased off the fediverse in those early mastodon days then I would have had no outside socialising. I left twitter because I was so unhappy there.
If I couldn't find another outlet for socialising, then I would have probably killed myself due to my own depression. A lot of people online are vulnerable and lack that social support network. Perhaps especially those who have different opinions to those who suggest this.
Isolation from the community is death to the human brain.