LOL. First of all, this one you should deal with by going to "HELP" on the top bar - then fill out a feedback form at the bottom of the page.
Looked at your feedback:
well, LameFace and I were talking in the live chat and we agreed to set up a couple games, and after the first one is over, we would play another one. so, i was just taking out his last few armies to win the first game, and he tells me that he just started the second game. I thought that he just joined it and didn't do anything in it yet. After I beat him in game one, i went to the other game, and HE'S ALREADY FORTIFYING BY THE TIME I GET THERE!!! I got angry and called him a cheater, and he argues with me saying that he's not...How is that not cheating??? He got mad about me calling him a cheater and stopped that game from being an rt...The funny thing is, i still beat this cheater in that game!!! That shows how bad of a conquerclub player LameFace is... LameFace, your an unfair player who pretty much sucks at playing, find a new game! Thanks for your grimy little points, cheater!
It's not cheating. It may be not a nice thing to do (I don't know what you had agreed to do), but it's not cheating. Read Rule 1 & 2.
So if you wanna leave him feedback, perhaps writing it in a different manner may be the way to do it?
Also: It's not retaliatory just because you both posted feedbacks and he posted after you. If he was upset by you calling him cheater (which is what he says), well, that's his notion. Two people can disagree and be upset and both may believe that they are right. So it's not a race to hand in the first neg. feedback.
But just pm him and try to wotk it out or fill out the form.