The issue is probably that there's a lot of erroneous information on the web, with little knowledge of where it is coming from & little accountability for validity.
Then froums such as these are probably lumped together with all the garbage that is out there. I've looked at a few internet boards that I won't visit again because of the topics of discussion & language used to express opinion, not to mention the constant "egging" on.
Even TFL would get trolled frequently.
But I'm with you - I've learned a lot from my time spent involved in "quality" internet boards, and there is a distinction.