@Roy Arkon Yup, I feel your pain man.
Mortal Kombat vs. DC Universe might not be regarded as the best game in the franchise, and it's not canon to the main storyline, but it's the 8th fighting game in the franchise; that's actual fact.
What I love about those keyboard warriors who try to force their opinions as fact is that if they just changed the wording of what they're saying a little, what they're trying to say would be presented better and not factually incorrect.
For my example, had the guy said "
StarCraft II feels so fundamentally different over the original game, and more fast paced to me that it doesn't feel like
Starcraft. I don't like the game because I think it's a poor sequel." that would be 100% fine. He's not contradicting actual fact and is clearly stating his opinion, and a valid opinion since we're talking in a subjective manner anyway.
I even told him this and worded it out for him, but nope, clearly actual facts are wrong and I'm ignorant!
For your example, I'm guessing if he said "I don't feel Mileena should return in the next game because she's been in the last four main story games and I think a break from the character would be good," there wouldn't have been an issue, since it's a good way of expressing opinion and not attempting to contradict actual fact?
Ultimately, how did you handle the situation? For mine, I simply kept repeating actual fact, and even quoted a few sources, and even dumbed it down to bullet point form for simplicity's sake. I blatantly told them that's as simple as I can present established facts, and if you still are unable to understand that, well...