I dont think this is the case at all. Especially on the math stack exchange I tend to go out of my way to link sources, books, pages, etc where I can find them. There have been times I've made an error not obvious but "simple" and have gotten beaten down to the point I dont even use it anymore. It's no different than stack overflow, where a power tripping mod will mark your question duped with something completely unrelated if the downvote brigade doesnt get to you first.