They're just much harder than people thought.

It's weird that people thought you could just bolt comments onto a webpage without problems, because we had all those years of Usenet to show that it wasn't that easy.

...he posted, on an online comment system.

edit: before the parent comment was edited, the most charitable reading of the comment was that internet commenting systems have a net negative effect on humanity

That's an awfully big generalization to post on an internet commenting system.

His comment made me slightly sadder than I was before I read it, so from that viewpoint it is accurate.