Thank you so much for your comment, it is really helpful!
I use the internet to put in practice what I am learning about critical thinking and argumentation (critical thinking course on Khan Academy). In environments like the Reddit Ethereum page it is much more reason centered and there are less dishonest participants so when my arguments are refuted it is very productive and I learn a lot. But on newspaper sites and blogs its more like a jungle.
I think what you say "the challenger has already made up their mind" is the key.
I will read the articles of the links you posted, thx!
If you're looking for well-policed blogs, you can try Slate Star Codex and any of the other "rationality blogs" listed in the LW wiki.
Especially in the comments of political articles or about economic issues I find myself arguing with people who question my authority about a topic rather than refute my arguments.
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Examples may be:
1:
Me: I think money printing by the Fed will cause inflation if they continue like this.
Random commenter: Are you an economist?
Me: I am not, but it's not relevant.
Random commenter: Ok, so you are clueless.
2:
Me: The current strategy to fight terror is not working because ISIS is growing.
Random commenter: What would you do to stop terrorism?
Me: I have an idea of what I would do, but it's not relevant because I'm not an expert, but do you think the current strategy is working?
Random commenter: So you don't know what you are talking about.
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It is not about my opinions above, or even if I am right or not, I would gladly change my opinion after a debate, but I think that I am being disqualified unfairly.
If I am right, how should I answer or continue these conversations?