I recently had a moderator edit one of my posts, but the edit only changed a couple nit picky stylistic things and added nothing substantive. As a result, I rolled back the edit. Shortly thereafter, the same moderator edited and then downvoted a number of other questions in my post history. Clearly, he's being vindictive after receiving a completely legitimate rollback. The posts he downvoted are high quality, provided detailed explanations of the problem and what I've tried, included multiple screenshots, and were not asked anywhere else.
If he had a legitimate reason to downvote the post, I would be totally fine with that as long as he provided some constructive feedback. However, there is also no private messaging system on the site where I can ask why a downvote was received.
I don't want to name names, and have no interest in getting into a downvote war with one of the most active users on the site. However, I would like to know if there is any mechanism on Stack Exchange to report abuse of downvotes by other users?