HN is different from Twitter. The reason users (correctly) flag such comments here is that we're trying for a specific kind of site (https://news.ycombinator.com/newsguidelines.html). One thing I often say (to a certain type of commenter) is that this isn't an ethical or moral rule—it's more like a game. Different games have different rules. If you're playing chess you don't get to tackle the bishop.

If Garry or anyone else had posted that on HN, users would certainly have flagged it, and we wouldn't override that.