This entire post is trolling by showing all those comments, as they are hidden from 99% of users by the flag function. Earnest is a natural part of any social structure, just like the toilet in every house, if you take down earnest then another earnest will rise up even worse than before, the best path to take is to accept it and move on. By me typing this comment you are drinking my blood :)
Most social structures have a way to avoid people like him...
it happens on youtube every week, and I simply hide that users comments from my channel, just like when I flush a toilet
Right, but that option doesn't exist here yet. It's what OP is asking for... :)
YouTube allows you to switch off your comment section. Every social media network deals with this in some way or another. The least constructive thing to do is to do nothing and pretend the problem doesn't exist.