[ben_w]

Only when spoken, not when written: https://theconversation.com/why-is-sarcasm-so-difficult-to-d...

[centimeter]

No, I have zero problem detecting sarcasm or irony in text. If you think about it for 5 seconds it's usually pretty clear.

[ben_w]

If you have zero problem, you are unusual.

Please note who wrote this paper, considering what they are famous for, as well as the results: http://web-docs.stern.nyu.edu/pa/kruger_email_ego.pdf