Yano, most of us are here to share ideas and information, not to win petty ego contests...If we all agree that none of us can know for sure without some kind of trusted or official source then there's basically no harm or foul in throwing around different ideas, especially if the ideas have some kind of reasoning behind it. The value of participation here, ideally, should be in the thought and discussion, not in trying to assert domination or superiority. There's no value in "winning" here. Blitzo had an opinion about the specs that were shared in the graphic, and he clearly showed he had a rationale for that opinion. He should (as should be the case for everyone here) be allowed to have an opinion without being targeted for personal abuse. That he disagreed with the figure in the graphic is not in of itself pretentious. The graphic is not some special authority, and disagreeing with it is not some special kind of offense. You may have disagreements with him of course, but you can explain why you disagree with someone without resorting to condescension and persecution.
We don't need anyone to appoint themselves the accuracy police here. We're not here to appease you every time you find some particular exception with how someone qualifies an idea. Nor are we here to be your punching bags, or to give you personal validation. In the future it would be nice if you could treat the people you interact with more respectfully, without lobbing personal accusations or attacking their character, especially since this seems to have become a recurring pattern in your exchanges with multiple members.