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You can change user's status to suspended and blocked, there is no term for either as the feature was never requested.

Blocked users can only log in and send feedback, suspended users can only edit own previous posts.

There is no way yet to destroy a user.

Regular users with certain reputation can flag offensive. When a particular number of flags accumulates the post is hidden.

No IP address bans yet.

These missing features can be implemented quite easily.

For the "destroy user" you have to decide what to do with posts where others followed up by either answering, commenting, or editing the post. Ideas about that?