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As [this answer](https://collab.codidact.org/posts/291874/291876#answer-291876) says, `db:seed` isn't the right tool here.

Short of dropping the entire database as suggested in that answer, you can delete individual flags in the database.  From the mysql console, get the IDs of the flags you want to remove:

```sql
SELECT id, name FROM post_flag_types;
```

And then delete the ones you don't want, for example:

```sql
DELETE FROM post_flag_types WHERE id=24;
```

Thanks ArtOfCode for the coaching.