I don't really follow the forums as much as I used to, but diyAudio [1] always seemed like it had a good distribution of domain experts to help quash the craziness.
It seems to get worse the more money the posters have (maybe because salesmen get to sell them more weird speakers), and also if they're British they start talking about special power cables and something called PRAT.
Headphone reviews often seem to have incorrect claims about "speed" and "effortlessness", although I think those might actually describe something, just not what they think it is.
[1] https://www.diyaudio.com/