I'd genuinely say that facebook, twitter, and especially reddit are worse places than 4chan at this point.
The echo chamber effect and bot manipulation really makes those places awful.
Reddit is becoming a bizarro world of alt left nutjobs right now, and they're for some reason or another completely unable to tell themselves. They're probably going to be worse than the alt right nutjobs on /pol/ soon. Only issue is that you can mostly avoid those alt right nutjobs by avoiding /pol/, but the alt left nutjobs are all over reddit even if you try to avoid them.