IMO it was a combination of moderators and users

Sure, the mods were not always the best on SO. But even if you did ask a question, you had to deal with a userbase that was more pedantic and judgy than Reddit. Usually you would get an answer if it was obvious, other times you would have to defend your question against some guy whose newfound obsession was whether you had an XY Problem. Or who was personally offended you weren't using whatever the fad library of the day was (e.g. jQuery).