I don't see any harm in letting people see it and make there own judgments on it.
The harm is to yourself and your reputation. If someone repeatedly posts low-value content, we quickly learn that it's a waste of time to read their posts, and will start skipping over them. Since you're presumably posting at a message board with the hope that people will read your posts, it might make sense to be a bit more judicious in what you choose to share.
Although one benefit of threads like this is that the responses can also reveal the opposite: who are the insightful critical-thinkers who are worth paying
more attention to? Unfortunately in this case I was already well-aware that matchewed and KingCoin are two of the forum's most-valuable assets, but relative-newbie warfreak2 gained some esteem-points in my mental catalog.
The interesting thing is that digging back to that reddit thread, the guy who made the map seems well-aware that it's pretty worthless, and it just got way more upvotes than it deserved for some reason.