Some of the facebook groups are ok but any forum outside of a small community is going to be full of new brewers asking basic questions and a handful of assholes. I don't mind the newbie questions I'm just past the point of wanting to answer those questions all the time myself. Over time it seems we've lost a lot of the more tenured posters around the various places. It happens but the overall quality of content feels like it's more newbie questions than deep discussions or explorations of novel subjects.
I don't spend anywhere near as much time on homebrewing forums these days which has more to do with the direction beer in general has gone in the past six or so years than the occupants of the forums. I'm not interested enough in hazy IPA, or IPA in general, quick souring methods, kveik, processed hop products, fruit purees, or pastry stouts, enough to brew them or talk about them in any detail. I still like perusing to see what is going on and new products but don't post anywhere near as much.