Having been on the receiving end of bullies much of my life, I find they work in various ways. One is, they seek out weak people (or seem to be weak) and as it's been said, People on the spectrum are animals of prey (meaning the ones that get eaten). They exploit them as they are easy targets.
Another is and I've experienced this firsthand, is a bully will get the group to turn against someone. By making up lies, spreading rumors, and making said person the scapegoat when something goes wrong. Many who don't want to be a target of the bully themselves, just blindly go along with or go along even if they know it's wrong.
While there are other ways, many bullies I find network this way. Getting the group to go along with them or seeking out a perceived threat, exploiting it, and thus making themselves look like the good guy.
Then people wonder why I don't talk all that much.
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If you don't say anything, you won't be called on to repeat it.
― Calvin Coolidge