The author then undid this correction (not by rolling back, but by editing every instance of "dispatch" back to "despatch"). I rolled this change back and left the following comment:
Please don't undo the spelling corrections. It is spelled dispatch, not despatch.
Unfortunately, the author repeated the previous editing back to "despatch" without replying to the comment.
What can we do to prevent such intentional harming of answers?
Of course I could roll back again, but this would just start an endless cycle.