For example, people on Reddit asking redundant questions and give equally redundant or unhelpful answers.
Whenever every ‘What’s the worst show you’ve seen?’ is asked, you’ll get 10,000 “Kardashians” answers, which is just easy karma farming.
If someone posts in a community that’s geared for something like opinions, but someone elects to just go on a full scale rant instead.
Reddit is a fairly unique exception to the usual moderator experience. I too used to be an admin on a couple of large forums and IRC servers and I’d say most of those people were decent. Reddit however is plaged with a large number of power mods in many of the medium to larger subs who’s sole purpose in life is to be an online lord of opinion and toxicity over others.
That’s not to say there’s not decent people too but I imagine your experience is squewed a bit if you ran smaller ones.