I believe there is a clear difference between my question and the question marked as a duplicate. I have edited the post to emphasize how it is different, now I'm posting here to see if someone can review it again.
My question: Where did the practice of using quotation marks to discredit an opponent ("scare-quotes") come from?
META: I generally don't trust people who complain on Meta Stack Exchange sites about stuff like this, but I believe my case is pretty strong here. It might be that I didn't communicate clearly enough, but I'm positive that the question that I'm trying to ask is not the same.