How (racist/sexist/whatever) harassment on Mastodon works:

1. Harasser replies to their target's post, with the reply set to "followers only", saying the most vile stuff you can imagine.

2. All the harasser's followers join in on the harassment, posting more vile stuff.

3. Nobody but the target and the harassment crew can see the vile stuff that was said.

4. Target is traumatized. Nobody else can see why.

5. Everybody says "I don't see it so it's not happening."

https://community.hachyderm.io/blog/2024/08/12/hachyderms-introduction-to-mastodon-moderation-part-1/