"There is a concept called 'strong opinions, weakly held' You might want to look into it."
These are fine methods of learning when you're surrounded by people significantly more knowledgeable than yourself. The problem is precisely the situation I was discussing: when you don't have a critical mass of knowledgeable people, it's the blind leading the blind, and thanks to the Dunning-Krueger effect, it's unlikely that you'll be able to tell who among the chorus of voices knows what they're talking about, and may even have trouble recognizing that you're going down the wrong path.
"As a side note, the internet is full of folks spouting off about things they know little about. So is life. Democracy is built on the concept of average voters voting on policies about complicated matters."
And direct democracy isn't terribly prevalent. Representative democracy, however, is based on electing representatives who are either themselves more knowledgeable or who can talk to (or employ) those who are on a whole range of subjects. And even on this count, I would argue we generally need to work on finding ways around our biases to make better selections.
"Either learn to deal with these topics as part and parcel of community life or prepare to be frustrated a lot."
You think my options are "live with it" or "be frustrated?" I choose the third option, to advocate for improvement, to advocate for greater education where it makes sense in the public sphere (such as economics), and to advocate for systems of government that are more resistant to direct action on matters that are likely to be adversely affected by common misunderstandings.