I agree, and didn't intend to express otherwise. It's not an exclusive community, but it is a community, and if you aren't in it you are in the out-group.
> The problem isn't differing opinions, the problem is that they disregard actual expertise and try ham-fisted attempts at "first principals" evaluations of a subject while ignoring contradictory evidence
I don't know if this is true or not, but if it is I don't think it's why people scorn them. Maybe I don't give people enough credit and you do, but I don't think most people care how you arrived at an opinion; they merely care about whether you're in their opinion-tribe or not.