Exchanging opinions, and the reasoning behind them, makes for lively discussion, and we don't (usually) take it personally, when someone disagrees with another. Sometimes, the very scenario you describe occurs. Someone posts about a widget, and the 'ridiculous' auction, and another member, or lurker, jumps on it. Sometimes, not.
As for gyusher, I don't think he believes that his opinion is the only 'right' one, for the world, any more than the rest of us do.
I don't know how long you lurked at AK, or how much reading you have done, but I think you will find that differing points of view can be discussed, with... enthusiasm, yeah, that's it, enthusiasm. If you and I hold opposing POV's, I would welcome your efforts to convince me of the validity of your opinion, and I expect you would do likewise. Success or failure, either way, I would hope we would respect each other, and maybe become friends.
If no one has said this yet, Welcome to AK.