This episode is too true. Of course, there's the difference between displaying a balanced view like: "I know that there's also very much good to say about the opposite, but this is why it fades in comparison" and "I love killzone 2, and I love Halo! Both the best games in the world". Of course, the second is just bullshit troll doctrine, and the first really shouldn't be necessary unless it's about an issue where appearing better than the other can ruin the argument, like a USA vs Europe debate. It's impossible to have one of those with people only pointing out the flaws of the other, all it ends up in is a hostile "mine is the best!!" shouting contest.
Showing reflection in the matter is not the same as "fair game". For instance, I had a comment about the american health system, where I said the Norwegian school system and the american health system really suffers from the same screwed up view that since it's the perfect country, you can't learn from other countries. But while those two are similar, there's a little difference between people dying, and people not learning proper math.
Really, saying "Because the xbox has the Halo series, it's the best console" DOES imply that you could automatically add "this is because in my opinion, the halo series is the best series out there, and I know many might disagree, but that's how I feel" in your head. If someone says something that's clearly an opinion, it probably is one, and should be treated as such. So instead of replying "that's not a good argument, halo doesn't constitute a basis to judge a console by" or "Halo isn't a good series (which is trolling tbh)", just say "well, if that's what you judge it by, I understand, I don't care much about Halo, nor any Xbox exclusive, so it's different for me"
(and no, I don't like Halo, found the first to really just be an average shooter with no impressive features other than being very well adapted for console, but with a terrible story and nonexistent character development, and really didn't bother checking the sequels (and it started the "no health bar" trend...))
Overly correct people really need to stop the whole "subjective opinions must be stated as such". A debate isn't a statistics course, unless people are actively implying that this is an objective fact, it's a subjective opinion.
And seriously, we need to be better at ignoring trolls. Really.