Without any additional context here by way of the messages you sent them, I can understand where the mod is coming from. So many new posts on a major sub like that one every few minutes, and there are only a handful of mods, who aren’t online 24/7. If the post isn’t reported enough to be in their sight when they review them, shit falls through the cracks. The bigger the sub, and the fewer moderators the more shit that slips by. They aren’t professionals. They aren’t paid for their time, and their time is entirely voluntary. Just because you may be on Reddit all day every day does not mean they are. This doesn’t even just apply to Reddit. It applies here as well as most public, community ran forums.