HN commenters should definitely use the '/s' tag, as it is essential to correctly label the intention of sarcastic comments.

    /s

Well, this isn't Reddit, so many we could have less sarcasm? Sarcasm isn't accessible even with text tags and doesn't help move the discussion forward.

Yes, HN is as hostile to humour as StackOverflow is to 'don't give ready to paste code, teach the man how to fish instead' answers.