I think you're worried too much about specific tribes and groups, and less about what information is good or bad. End of the day almost any source is going to tell you some things that are useful, some things that are useless, and some things that are actively harmful. I'm not trying to say all sources are equal, but mainstream medicine has a lot to answer for in terms of giving bad advice for decades (both now and historically). For a long time mainstream medicine also thought smoking was healthy and bloodletting was a way to treat infections. I don't say that to mean "don't see doctors" or "get your nutritional advice from chiropractors", I just think it's worth pointing out that with ANY source you need to wary. Autodidactism is a very good thing IF you use critical thinking when evaluating your sources.