I'm not sure where Bob has been spending his time on the internet, because this is honestly not an issue I see cropping up very often.
Personally, I would say fanboyism is characterized by an inability to accept that others don't like whatever it is they're a fanboy of. I see it less when people talk about what they like, and more when they talk about things they don't. As in someone will express their disapproval for something and the fanboys descend upon them to rip them apart.
Using the Killzone 2 example, when someone calls someone a 360 fanboy for not liking it, the person defending it is more likely to be the fanboy.
Thus, a fanboy can be spotted by what they do and say, rather than what they don't say.
(Rhetorical)Why did Bob bring this up? Well, I'm guessing Bob is getting annoyed by the contents of his inbox. All I can say to that is, sorry, but if you have an opinionated internet show (or 2 in your case) it goes with the territory. There will always be people who can't stand others disagreeing with them, or who think everyone should like all the things they like, etc.
What I think people on the internet need to stop doing, personally, is all the ad hominem attacks. Seriously, at least 50% of all internet arguments consist of nothing but personal attacks that have nothing to do with the topic being discussed.
Civility people is not the fairness doctrine. It's being able to express your opinion and disagree with someone without acting like a jackass. Calling someone names, insulting them, or disregarding their opinion on trivial grounds is stuff you would do in elementary (primary) school. However, in all my time on the internet I've only run across a handful of people who can have a serious discussion about anything without resorting to those methods.
I guess, the only thing I have against what you said, Bob, is that you're confusing what's been happening with attempted civility when, in reality, it's the farthest thing from it.