"Idiot" in Greek means one who is idiosyncratic in his ways and opinion. Basically, one who isn't using common sense. What's wrong with saying that?

The guidelines have made this crystal clear:

> When disagreeing, please reply to the argument instead of calling names. E.g. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3."

> Be civil. Don't say things you wouldn't say in a face-to-face conversation. Avoid gratuitous negativity.

https://news.ycombinator.com/newsguidelines.html

Well, "idiot" has rich, historic semantic content that I think fit really well for the occasion. It's not my fault that it's a blacklisted word according to the book of HackerNews Ethics.