http://imgur.com/1B6t61M I disagreed with him on something that he said, and the next time I checked forums he had disliked something I said. And there's nothing on my post to even disagree about? I think he was mad that I disagreed with him...
It's not considered abuse unless the rating is spammed for no reason. If he starts spamming ratings on you report that, otherwise he has the right to give you that dislike. Locking - Archiving
