It's not uncommon to see incorrect answers highly upvoted on AskHistorians - even ones from flaired users. That's one of the problems with the sub - though it's better than most Reddit subs, it's still far below the quality that most of its users and moderators believe it to be. Like with Wikipedia, you need to be skeptical of claims and actually look at the sources.

But mostly, it's a graveyard of unanswered questions.

And so fairly representative of the real world.