Of course, we've seen nothing to indicate the guy actually is a friend of Majoru's. All available evidence is that Majoru doesn't like him, has never liked him, would be perfectly happy to never see him again, and is only prevented from reaching that happy state by the fact that they game together. (Nor is there anything wrong with this. Everybody has people they don't like.)
I think he's kinda dumb. I wouldn't shed any tears if things happened and they broke up so that I could still be friends with his girlfriend and our other mutual friends without likely seeing him again.
The problem is that they run board game nights on a fairly regular basis which I try to attend. Another couple I know are mutual friends with him. As with most social circles, everyone is rather intertwined. Especially in our city where, despite having a population of 600,000 people, the gaming and geek communities are VERY small. There's a couple hundred of us and we all kind of know each other.
But he is my "friend" in that we can have civil conversations and we have a lot in common so we always have things to talk about. We both like board games, anime, science fiction, fantasy, and D&D. I've often spent 2 or 3 hours just talking with the two of them about whatever after our Sunday sessions end. I enjoy their company(for the most part). We spent years trying to convince the two of them(ok, mostly I was trying to convince his gf, since I know she'd really like it) to come to GenCon with us. Last year they actually did and we stayed in the same hotel room and played all the same games all weekend(which was a test of my patience near the end to have to game with him that much). They've invited us to make WoW costumes with them and line up for the premiere of the Warcraft movie since they are super excited about it. I'm not that excited but I know they are and I like to support my friends.
Hanging out with him is fun, for the most part, because he enjoys the same activities I do. And they mostly involve board gaming, card gaming, movies, and so on. I rarely have to deal directly with his personality. Whether it's him or someone else saying "I put a settlement here. That's the end of my turn." is not really consequential to me.
It's his gaming quirks that bug me the most. His characters are bland and cardboard. We're starting another campaign in our Sunday game and I think he plans on playing his 4th or 5th(I lost count now) Warlock. ALL of them have taken the feat to give people temporary hitpoints because as he says "Why would anyone with a good charisma mod NOT take that feat? It would just be stupid not to." None of them have a personality at all, none of them have any real background other than picking the one that gives him the most in game benefit.
He once yelled at one of our friends(the one that was at the table with them when he stormed off), lecturing them because their character has the highest charisma in the party and they weren't the one talking to the NPCs. The woman in question is VERY shy and her characters tend to not want to interact with anyone. But she was playing a Warlock so she had a high Charisma and part way through the game he said "You know, it's your JOB to talk to the NPCs, right? You have a high Charisma and therefore have the best bonus in the party so YOU need to be the one talking to every NPCs we come across. I'm doing all the talking and I'm failing rolls because my character isn't as good as yours is. That's not right. We're likely missing out on things in this adventure because we aren't rolling high enough! So, you need to start taking charge and playing the game properly."
He did the same thing a couple of times until I kind of gave him crap one game about letting people play their characters the way they want to play them and that the difference between a +2 and a +0 wasn't really enough to worry about so he should take it easy.
Since then I see him twitch a little bit every time anyone in the party whose charisma isn't the absolute highest in the group talks to an NPC. But he hasn't lectured anyone on it recently.