I don't remember this "captain", maybe he was before my time. But in a way, I know exactly who you're talking about, because I've run into a lot of those over the yers, and yeah - it only takes one of them to drag the whole board down into the mud.
There's another Packer board out there that I don't think anyone here is on, and I don't even participate with anymore. I've been there about 12 yearas, IFRC. It's got just one guy on there (a retired drill sergeanrt, I thnk) who only wants to fight people who disagree with him, on basically any single thing. No matter what the topic, there's never any "well, I think I'm right, but maybe I'm not, so I guess we just disagree". It's simply, "if you disagree with me, you're a despicable idiot", and then he attacks and insults the other poster viciously and relentlessly. From the sound of it, it's much worse than the captain guy, but still follows the same pattern.
It's completely shaped the entire tone of the board. It doesn't matter what the topic is; if you disagree with him about trading Rodgers, or whether the salary cap is a real thing that teams have to take into consideration when signing contracts, you're a moron - and a dozen other things that are probably worse. He doesn't even try to hide it, he just freely admits that all he wants to do is to fight people who disagree with him.
Abd the thing is, there are some really good people there, and very knowledgable football fans. You can learn a hell of lot from that group of people. But there's this rain cloud hangiong over every conversation, because every single step someoe takes, you never know if you're about to take a bullet from a sniper and sudeenly find yourself in a fire fight. Nobody can relax, or feel comfortable with people. There's just no fun there. Every single thing is going to be a fight, or at least some sort of insult.
And it's really just that one guy who's been the driving force behind that.
It's one of the things I really like about this board. People here value behaving like grownups (or at least, the Packer fans do). We may disagree, but we all understand that there are plenty of other places for us to fight if we like, and this is not the right board for that. People here show respect for people who disagree with them.