Yeah, in my experience there's a lot of misinformation floating around r/badhistory. It's not uncommon to have some comments halfway down (below all the highly upvoted snark and attempts at humor) that point out the inaccuracies in a post, so that's something at least.
But a large part of the problem with r/badhistory, and r/AskHistorians as well, is that it seems like most of the users don't realize that being better at history than most of Reddit is an extremely low bar. There's certainly some good stuff that ends up there (well, in r/AskHistorians, less so in r/badhistory), but there's still a lot of junk as well, and too many people act as if the stuff there is equivalent to published work by professional historians.
But a large part of the problem with r/badhistory, and r/AskHistorians as well, is that it seems like most of the users don't realize that being better at history than most of Reddit is an extremely low bar. There's certainly some good stuff that ends up there (well, in r/AskHistorians, less so in r/badhistory), but there's still a lot of junk as well, and too many people act as if the stuff there is equivalent to published work by professional historians.