Hey, I think the guy I mentioned in this was this erz, but I'm not sure. Could be. So he has a history? He's like famous 
It was indeed. Perhaps he's the PS3 equivalent of the Xbox dude who refuses to play with BSNers, as my alt a/c is actually the incredibly innovative 'GruntKitterhand'. 
(The quote in your sig cracks me up every time I see it btw
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Thanks. 
About the guy:
Back then, when I made my first steps into silver, I encountered him. He was all alone, in a public lobby, and put an instant kickvote on me and set this message: guy never then wait forever. I was confused as hell, what does he want? I replied, that if he wants me to leave just say so, if not, what is the problem? I thought he was having a problem that I not equipped any consumables. No reply whatsoever. I quitted. Next try, game puts me in his lobby, kickvote, I quit. Next try, this again. Fourth try was a match, but after that, the above procedure. By this time, I was really annoyed, because I thought the guy was trolling people by maintaining a lobby and kicking everyone who comes in the lobby, so I stayed in the lobby. He switched it to private and put a kickvote on me. I just left the PS on, to troll the guy back, and went to watch some football. After the match, the lobby was still on. Holy crap, I did not expect that. I asked him, what the hell is he doing. He answered, that he can show me hell and break me into a thousand pieces. That made me laugh, so I replied why trolling people with empty lobbies. This is where it turned out that he wasn't trolling. Sadly, he was serious the whole time.
He sent me some looong messages, bragging that he is able to solo silver twice with no equipment put on while I am bitching around in a normal pug match, calling me an idiot, useless, a leecher (notice, that we didn't even managed to play yet). My reply: then why are you playing silver, why not gold and why won't you play private with friends (I deliberately try to not insult him in my messages, to really figure out what's his deal. It's not to try to be "holier art thou", I just didn't want the messages to be concentrated on insults). His answer? He is looking for worthy people and not for scums like me. My reply: worthy to coop with? If this was a PVP, I'd understand you, but are you so smug that you are trolling people by this way in a coop game? Him: nobody likes N7 farmers, I am an useless leecher, I am worthless in a party, I would just killsteal and leech my way to get more n7p/cp/exp, I am a scum, me and the other people should be banned from this game.
My reply: I understand hating leechers, but by your definition the majority of the playerbase are leechers because they are not on gold level at least and many people doesn't even want to be good just enjoy the game as casual players. His reply: Bioware made a bad job on this, on Nintendo you can ban people form even joining your lobby and hosts are more important than sucky leechers like me. This was where I just sit before the TV dumbfounded and decided to end this link of comments: I admit it sounds bad, goodbye. Well, he didn't think so, he sent me his longest message: people who max out a character, and joins with lvl 1 chars in gold matches are twinks and only care about n7 rank, and when he changed a silver room into a plat room a noob joined with a lvl 3 phaeston. They are rude and unkickable mid-match, that is why they try that.
I didn't reply to this, he never replied to me again, no matter what my equipment or level was, he always put a kickvote on me on silver, so I think he remembers me.
Much later I actually joined him in mid-match, I guess he forgot to switch to private. He produced a really high score and had a blast in a Silver match, so he is a good player, just an *******. Plus point, he didn't have a mic, so at least he only do this in writing. (I actually searched back my messages, so what you can read here are the actual words, just in a nutshell because his messages were way longer.)
Edit: TLDR: he is the worst type of elitist. Avoid him, always quit if you get in his lobby, even if you have the unknown requirements of playing with him. Let him solo.