If you look at the notes page of the guy you were playing, he evidently accuses everyone who beats him of cheating. I have never seen so many negative comments on one profile.
This is a clear case of abuse. You should report him. I find it hard to believe he would be allowed to behave this way and stay on the site.
Be sure you cite the 48 pages of notes, mostly negative, about what this guy does.
Whatever you do, don't let it get to you. He obviously exults in making people crazy. Many posters reported that he blocks them, which undoubtedly drives them wild.
What are going to report him for?
Using tricks that the site allows you to use? "Silly rabbit, tricks are for kids".
Let me put it this way;
That's not a good defense
Today I was playing a decent standard game with a player rated similarly to myself. I had a good position, probably about equal to his, and from that I was playing tactically well. Typically, when playing well my opponent will congratulate me or say nothing. Today was no different until this game. I forked his queen and rook and my opponent had the audacity to accuse me of using an engine to accompany me in my game. Firstly, a simple fork two moves out isn't much of an accomplishment, more just negligence on their part. Secondly, playing with sore losers is never a good time. I'm not sure of the number of people that will see this post but for those of you that do, please be a constructive member of the community rather than a destructive member. Unfounded accusations are annoying and do nothing for anyone. If your opponent is playing well, either have something nice to say about it, or don't say anything at all.