The medium is hard to separate from the message; it is built in to threaded commenting by the voting system. People upvote the comments that best express ideas that they support and as a consequence it is usually hard to add to the most highly upvoted comment. But that is the most obvious comment to attach opposing views to. That leads to a predictable tick/tock thread structure where every 2nd post is thematically similar but every other post is contrary.

The irony here is present but better interpreted as the forum structure being biased towards criticism.

The original comment already contained its own irony, directing unfair criticism at critics. Hemingway wasn't exactly some impartial observer of human behavior here. He was butthurt that a published commentator once said something bad about his writing.

The reality of military operations, which Hemingway himself probably knew having served himself (though maybe the situation has changed as I can't claim familiarity with the specifics of how it worked over a century ago), is that the biggest critic of any unit involved in a battle post-battle is the unit itself. Every action is always followed by an after-action review, in which you go over what went well, what went wrong, what you should continue, and what you should change. It's neither unrelentingly positive nor negative. It's honest.

But for whatever reason, much of the creative class seems to think anyone who isn't able to do something themselves is universally unqualified to comment on the work of others. Plenty of rather obvious examples show this to be ridiculous. The top coaches and trainers throughout history were rarely great athletes themselves.

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Irony is often the language of truth.