It looks to me like that guy gives 4 stars on most ratings. He dinged you down to 3 on fair play and attitude. Presumably he wasn't especially pleased with your comments in game chat. I read through it and don't think you said anything inappropriate, but some people aren't especially keen on alliances of any sort. If he was really trying to hurt your rating, he would have given you 1 star on fair play instead of 3. As
72o said, don't worry about it.
Colonel Krink doesn't appear to give ratings below 3 stars except in very clear cases, so he clearly doesn't have a problem with ratings abuse. If you want to complain about someone, I'd suggest going after the guy that gave you a really poor rating:
tubmen. That one appears to give consistently bad ratings and could reasonably be brought to the attention of the Cheating and Abuse moderators.