I had a dick friend, but not in the way you discribed, he was more of a subtle dick. When we were really young, like 13, we played card games like yugioh and what not, he would steal cards I had, cheat like mad, etc etc.
When that was done we moved on to video games where this crap continued, IN EXAMPLE, in Phantasy star online I would bring my character over via memory card, play, forget to take my character back, and while I was goine, he would access my character, steal my stuff, and say my character got corrupted, only to see his with ALL MY STUFF. so I stopped playing online games with him.
The last straw had to be when the game we played moved from co-op to versus, we would play every game 1v1, his rules, his maps, on anything,
Example time again, Halo 3, we would play a broken zombie game where the humans could sit in this one spot and the zombies would be cattle to the slaughter because all the weapons spawned where the human would spawn.
After all this, I confronted him on it, told him that if he wasnt going to balance the teams then its not fun for anyone, told him that both sides to anything need to have a equal chance from start to finish for the games to be fun, but of course he didnt listen.
In case you cant tell I dont talk to him anymore.